Galanthamin
Übersicht
Beschreibung
Galantamin: ist ein natürliches Alkaloid, das aus den Zwiebeln und Blüten verschiedener Pflanzen der Familie der Amaryllidaceae gewonnen wird, wie z. B. Galanthus nivalis (gemeiner Schneeglöckchen), Galanthus caucasicus (kaukasischer Schneeglöckchen) und andere . Es ist vor allem für sein Potenzial zur Verlangsamung des kognitiven Abbaus bekannt und wird klinisch zur Behandlung von Alzheimer-Krankheit im Frühstadium und Gedächtnisstörungen eingesetzt .
Wirkmechanismus
Target of Action
Galanthamine, also known as Galantamine, primarily targets the acetylcholinesterase (AChE) enzyme . AChE is a widely studied therapeutic target used in the treatment of Alzheimer’s disease . Galanthamine acts as a reversible, competitive inhibitor of AChE . It also acts as an allosteric modulator of the nicotinic receptor , giving its dual mechanism of action clinical significance .
Mode of Action
Galanthamine works by blocking the breakdown of acetylcholine in the synaptic cleft, thereby increasing acetylcholine neurotransmission . This is achieved by inhibiting the activity of the AChE enzyme, which is responsible for the hydrolysis of acetylcholine . By slowing down acetylcholine catabolism, galanthamine increases the levels of acetylcholine in the synaptic cleft .
Biochemical Pathways
The primary biochemical pathway affected by galanthamine is the cholinergic pathway . By inhibiting AChE, galanthamine increases the concentration of acetylcholine, a key neurotransmitter in this pathway . This leads to enhanced cholinergic neuron function and signaling .
Pharmacokinetics
Galanthamine exhibits good bioavailability, with 80–100% of the drug being absorbed after oral administration . It is partially metabolized in the liver by the CYP2D6 and CYP3A4 enzymes . The elimination half-life of galanthamine is approximately 7 hours . About 95% of the drug is excreted in the urine, with 32% of this being unchanged . The remaining 5% is excreted in the feces .
Result of Action
The primary molecular effect of galanthamine’s action is the increased concentration of acetylcholine in the synaptic cleft . This leads to enhanced cholinergic neuron function and signaling . On a cellular level, this results in improved cognitive function, including memory processing, reasoning, and thinking .
Action Environment
Environmental factors can influence the action, efficacy, and stability of galanthamine. For instance, studies have shown that water stress conditions can affect the bioaccumulation of galanthamine in plants . Moderate water deficiency (50% water deficit irrigation) was found to produce the highest levels of galanthamine . This suggests that environmental conditions can play a significant role in the availability and efficacy of galanthamine.
Wissenschaftliche Forschungsanwendungen
Chemie: Galantamin wird als Modellverbindung in der synthetischen organischen Chemie verwendet, um die komplexe Synthese von Naturstoffen zu untersuchen .
Biologie: In der biologischen Forschung wird Galantamin verwendet, um die Mechanismen der Acetylcholinesterase-Inhibition und ihre Auswirkungen auf die Neurotransmission zu untersuchen .
Medizin: Galantamin wird klinisch zur Behandlung von leichter bis mittelschwerer Demenz im Zusammenhang mit der Alzheimer-Krankheit eingesetzt . Es wird auch für seinen potenziellen Einsatz bei anderen neurodegenerativen Erkrankungen untersucht .
Industrie: In der pharmazeutischen Industrie wird Galantamin als Wirkstoff in Medikamenten zur Behandlung kognitiver Beeinträchtigungen eingesetzt .
Wirkmechanismus
Galantamin wirkt, indem es das Enzym Acetylcholinesterase hemmt, das den Neurotransmitter Acetylcholin abbaut . Durch die Hemmung dieses Enzyms erhöht Galantamin den Acetylcholinspiegel im synaptischen Spalt und verstärkt die cholinerge Neurotransmission . Darüber hinaus wirkt Galantamin als allosterischer Modulator von nikotinergen Acetylcholinrezeptoren, was seine therapeutische Wirkung weiter verstärkt .
Biochemische Analyse
Biochemical Properties
Galanthamine inhibits the degradation of neurotransmitters acetylcholine (ACh) by binding to the enzyme, acetylcholinesterase (AChE) which is responsible for degrading ACh . The resulting accumulation of ACh caused by galanthamine leads to increased neurotransmission causing continuous stimulation of the muscles, glands .
Cellular Effects
The increased neurotransmission caused by galanthamine can have various effects on cells. It can influence cell function by impacting cell signaling pathways and gene expression. It can also affect cellular metabolism by altering the levels of neurotransmitters in the cell .
Molecular Mechanism
Galanthamine exerts its effects at the molecular level through its binding interactions with acetylcholinesterase. By inhibiting this enzyme, galanthamine prevents the degradation of acetylcholine, leading to an increase in the levels of this neurotransmitter. This can result in changes in gene expression and cellular function .
Temporal Effects in Laboratory Settings
The effects of galanthamine can change over time in laboratory settings. Information on the product’s stability, degradation, and any long-term effects on cellular function observed in in vitro or in vivo studies is currently being researched .
Dosage Effects in Animal Models
The effects of galanthamine can vary with different dosages in animal models. Studies are being conducted to determine any threshold effects observed in these studies, as well as any toxic or adverse effects at high doses .
Metabolic Pathways
Galanthamine is involved in various metabolic pathways. It interacts with enzymes such as acetylcholinesterase and can affect metabolic flux or metabolite levels .
Transport and Distribution
Research is ongoing to determine how galanthamine is transported and distributed within cells and tissues. This includes studying any transporters or binding proteins that it interacts with, as well as any effects on its localization or accumulation .
Subcellular Localization
The subcellular localization of galanthamine and any effects on its activity or function are currently being researched. This includes studying any targeting signals or post-translational modifications that direct it to specific compartments or organelles .
Vorbereitungsmethoden
Synthetische Routen und Reaktionsbedingungen: Galantamin kann durch verschiedene Methoden synthetisiert werden, darunter biomimetische oxidative Kupplungsreaktionen, Übergangsmetall-katalysierte Reaktionen und Umlagerungsreaktionen . Einige wichtige synthetische Strategien beinhalten:
Oxidative Phenolkupplung: Diese Methode beinhaltet die oxidative Kupplung von Phenolen, die für die Totalsynthese von Galantamin umfassend untersucht wurde.
Übergangsmetall-katalysierte Reaktionen: Dazu gehören die Heck-Reaktion, die Enyn-Ringschlussmetathese (RCM) und die dynamische kinetische Auflösung.
Umlagerungsreaktionen: Beispiele sind die Semipinacol-Umlagerung und die Johnson-Claisen-Umlagerung.
Industrielle Produktionsmethoden: Die industrielle Produktion von Galantamin beinhaltet die Extraktion aus natürlichen Quellen oder die synthetische Produktion. Das erste industrielle Verfahren wurde 1959 entwickelt . Neuere Fortschritte konzentrierten sich auf die Optimierung synthetischer Routen, um die Ausbeute zu verbessern und die Kosten zu senken .
Analyse Chemischer Reaktionen
Arten von Reaktionen: Galantamin unterliegt verschiedenen chemischen Reaktionen, darunter:
Oxidation: Galantamin kann oxidiert werden, um verschiedene Derivate zu bilden.
Reduktion: Reduktionsreaktionen können die funktionellen Gruppen in Galantamin modifizieren.
Substitution: Substitutionsreaktionen können verschiedene funktionelle Gruppen in das Galantaminmolekül einführen.
Häufige Reagenzien und Bedingungen:
Oxidation: Häufige Oxidationsmittel sind Wasserstoffperoxid und Kaliumpermanganat.
Reduktion: Es werden Reduktionsmittel wie Natriumborhydrid und Lithiumaluminiumhydrid verwendet.
Substitution: Verschiedene Reagenzien, darunter Halogene und Alkylierungsmittel, werden für Substitutionsreaktionen verwendet.
Hauptprodukte: Die Hauptprodukte, die aus diesen Reaktionen gebildet werden, sind verschiedene Galantamin-Derivate mit modifizierten funktionellen Gruppen, die unterschiedliche pharmakologische Eigenschaften haben können .
Vergleich Mit ähnlichen Verbindungen
Ähnliche Verbindungen:
Rivastigmin: Ein weiterer Acetylcholinesterase-Hemmer zur Behandlung der Alzheimer-Krankheit.
Donepezil: Ein weit verbreiteter Acetylcholinesterase-Hemmer mit einem ähnlichen Wirkmechanismus.
Lycorin: Ein Alkaloid mit Acetylcholinesterase-hemmender Aktivität, jedoch weniger potent als Galantamin.
Einzigartigkeit: Galantamin ist einzigartig aufgrund seines dualen Wirkmechanismus, der sowohl die Acetylcholinesterase hemmt als auch die nikotinergen Acetylcholinrezeptoren moduliert . Diese duale Wirkung verstärkt seine therapeutische Wirksamkeit im Vergleich zu anderen Acetylcholinesterase-Hemmern .
Eigenschaften
IUPAC Name |
(1S,12S,14R)-9-methoxy-4-methyl-11-oxa-4-azatetracyclo[8.6.1.01,12.06,17]heptadeca-6(17),7,9,15-tetraen-14-ol | |
---|---|---|
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
InChI |
InChI=1S/C17H21NO3/c1-18-8-7-17-6-5-12(19)9-14(17)21-16-13(20-2)4-3-11(10-18)15(16)17/h3-6,12,14,19H,7-10H2,1-2H3/t12-,14-,17-/m0/s1 | |
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
InChI Key |
ASUTZQLVASHGKV-JDFRZJQESA-N | |
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
Canonical SMILES |
CN1CCC23C=CC(CC2OC4=C(C=CC(=C34)C1)OC)O | |
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
Isomeric SMILES |
CN1CC[C@@]23C=C[C@@H](C[C@@H]2OC4=C(C=CC(=C34)C1)OC)O | |
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
Molecular Formula |
C17H21NO3 | |
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
DSSTOX Substance ID |
DTXSID2045606 | |
Record name | Galanthamine | |
Source | EPA DSSTox | |
URL | https://comptox.epa.gov/dashboard/DTXSID2045606 | |
Description | DSSTox provides a high quality public chemistry resource for supporting improved predictive toxicology. | |
Molecular Weight |
287.35 g/mol | |
Source | PubChem | |
URL | https://pubchem.ncbi.nlm.nih.gov | |
Description | Data deposited in or computed by PubChem | |
Physical Description |
Solid | |
Record name | Galantamine | |
Source | Human Metabolome Database (HMDB) | |
URL | http://www.hmdb.ca/metabolites/HMDB0014812 | |
Description | The Human Metabolome Database (HMDB) is a freely available electronic database containing detailed information about small molecule metabolites found in the human body. | |
Explanation | HMDB is offered to the public as a freely available resource. Use and re-distribution of the data, in whole or in part, for commercial purposes requires explicit permission of the authors and explicit acknowledgment of the source material (HMDB) and the original publication (see the HMDB citing page). We ask that users who download significant portions of the database cite the HMDB paper in any resulting publications. | |
Solubility |
Crystals from water; decomposition 256-257 °C. Sparingly sol in cold; more sol in hot water. Very sparingly sol in alcohol, acetone. /Hydrochloride/, Fairly soluble in hot water; freely soluble in alcohol, acetone, chloroform. Less sol in benzene, ether., 1.70e+00 g/L | |
Record name | GALANTAMINE | |
Source | Hazardous Substances Data Bank (HSDB) | |
URL | https://pubchem.ncbi.nlm.nih.gov/source/hsdb/7361 | |
Description | The Hazardous Substances Data Bank (HSDB) is a toxicology database that focuses on the toxicology of potentially hazardous chemicals. It provides information on human exposure, industrial hygiene, emergency handling procedures, environmental fate, regulatory requirements, nanomaterials, and related areas. The information in HSDB has been assessed by a Scientific Review Panel. | |
Record name | Galantamine | |
Source | Human Metabolome Database (HMDB) | |
URL | http://www.hmdb.ca/metabolites/HMDB0014812 | |
Description | The Human Metabolome Database (HMDB) is a freely available electronic database containing detailed information about small molecule metabolites found in the human body. | |
Explanation | HMDB is offered to the public as a freely available resource. Use and re-distribution of the data, in whole or in part, for commercial purposes requires explicit permission of the authors and explicit acknowledgment of the source material (HMDB) and the original publication (see the HMDB citing page). We ask that users who download significant portions of the database cite the HMDB paper in any resulting publications. | |
Mechanism of Action |
Alzheimer’s disease is characterized by progressive, irreversible degeneration of acetylcholine-producing neurons, cognitive impairment, and the accumulation of neurofibrillary tangles and amyloid plaques. The cholinergic system plays a critical role in memory, alongside other important neural functions such as attention, learning, stress response, wakefulness and sleep, and sensory information. Studies show that acetylcholine (ACh) is involved in the modulation of acquisition, encoding, consolidation, reconsolidation, extinction, and retrieval of memory. The gradual loss of cholinergic neurons in Alzheimer’s disease (AD) may, therefore, contribute to the memory loss exhibited by AD patients. Acetylcholinesterase is secreted by cholinergic neurons to rapidly hydrolyze ACh at the synaptic cleft to release acetate and choline. Choline is later recycled back into the presynaptic cholinergic neuron via reuptake by the high-affinity choline transporter. There is some evidence demonstrating the potential involvement of the acetylcholinesterase enzyme in the formation of amyloid fibrils. Galantamine competitively and reversibly inhibits the anticholinesterase enzyme in the CNS (namely in the frontal cortex and hippocampal regions) by binding to the choline-binding site and acyl-binding pocket of the enzyme active site. By blocking the breakdown of ACh, galantamine enhances ACh levels in the synaptic cleft. Nicotinic acetylcholine receptors (nAChR) in the CNS are mostly expressed at the presynaptic neuronal membrane to control the release of multiple neurotransmitters, such as ACh, glutamate, GABA, dopamine, serotonin, norepinephrine. Agonists of nAChRs improve performance in cognitive tasks, while antagonists of nAChR impair cognitive processes. Some studies show a decrease in the expression and activity of nAChRs in patients with AD, which may explain the reduction in central cholinergic neurotransmission in these patients. Galantamine binds to nAChRs at the allosteric site, leading to a conformational change of the receptor, increased ACh release, and increased activity of neighbouring glutaminergic and serotoninergic neurons. The modulation of nAChRs facilitates both excitatory and inhibitory cholinergic transmissions in brain tissues and increases receptor sensitivity. The modulated release of other neurotransmitters by galantamine may also contribute to the upregulation of nAChRs and amelioration of behavioural symptoms in AD., Galantamine, a tertiary alkaloid, is a competitive and reversible inhibitor of acetylcholinesterase. While the precise mechanism of galantamine's action is unknown, it is postulated to exert its therapeutic effect by enhancing cholinergic function. This is accomplished by increasing the concentration of acetylcholine through reversible inhibition of its hydrolysis by cholinesterase. If this mechanism is correct, galantamine's effect may lessen as the disease process advances and fewer cholinergic neurons remain functionally intact. There is no evidence that galantamine alters the course of the underlying dementing process., The cause of cognitive impairment in Alzheimer's Disease is not fully understood, it has been shown that acetylcholine producing neurons degenerate. The cholinergic loss has been correlated with cognitive impairment and a density of amyloid plaques. Galantamine is a tertiary alkaloid and it competes with and is a reversible inhibitor of acetylcholinesterase. The exact mechanism of galantamine is not known, but it is believed to enhance cholinergic function. | |
Record name | Galantamine | |
Source | DrugBank | |
URL | https://www.drugbank.ca/drugs/DB00674 | |
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Record name | GALANTAMINE | |
Source | Hazardous Substances Data Bank (HSDB) | |
URL | https://pubchem.ncbi.nlm.nih.gov/source/hsdb/7361 | |
Description | The Hazardous Substances Data Bank (HSDB) is a toxicology database that focuses on the toxicology of potentially hazardous chemicals. It provides information on human exposure, industrial hygiene, emergency handling procedures, environmental fate, regulatory requirements, nanomaterials, and related areas. The information in HSDB has been assessed by a Scientific Review Panel. | |
Color/Form |
Crystals from benzene | |
CAS No. |
357-70-0, 23173-12-8 | |
Record name | (-)-Galantamine | |
Source | CAS Common Chemistry | |
URL | https://commonchemistry.cas.org/detail?cas_rn=357-70-0 | |
Description | CAS Common Chemistry is an open community resource for accessing chemical information. Nearly 500,000 chemical substances from CAS REGISTRY cover areas of community interest, including common and frequently regulated chemicals, and those relevant to high school and undergraduate chemistry classes. This chemical information, curated by our expert scientists, is provided in alignment with our mission as a division of the American Chemical Society. | |
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Record name | Galantamine [USAN:INN:BAN] | |
Source | ChemIDplus | |
URL | https://pubchem.ncbi.nlm.nih.gov/substance/?source=chemidplus&sourceid=0000357700 | |
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Record name | (+/-)-Galantamine | |
Source | ChemIDplus | |
URL | https://pubchem.ncbi.nlm.nih.gov/substance/?source=chemidplus&sourceid=0023173128 | |
Description | ChemIDplus is a free, web search system that provides access to the structure and nomenclature authority files used for the identification of chemical substances cited in National Library of Medicine (NLM) databases, including the TOXNET system. | |
Record name | Galantamine | |
Source | DrugBank | |
URL | https://www.drugbank.ca/drugs/DB00674 | |
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Record name | Galantamine | |
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Record name | Galanthamine | |
Source | EPA DSSTox | |
URL | https://comptox.epa.gov/dashboard/DTXSID2045606 | |
Description | DSSTox provides a high quality public chemistry resource for supporting improved predictive toxicology. | |
Record name | GALANTAMINE | |
Source | FDA Global Substance Registration System (GSRS) | |
URL | https://gsrs.ncats.nih.gov/ginas/app/beta/substances/0D3Q044KCA | |
Description | The FDA Global Substance Registration System (GSRS) enables the efficient and accurate exchange of information on what substances are in regulated products. Instead of relying on names, which vary across regulatory domains, countries, and regions, the GSRS knowledge base makes it possible for substances to be defined by standardized, scientific descriptions. | |
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Record name | GALANTAMINE, (±)- | |
Source | FDA Global Substance Registration System (GSRS) | |
URL | https://gsrs.ncats.nih.gov/ginas/app/beta/substances/1T835Z585R | |
Description | The FDA Global Substance Registration System (GSRS) enables the efficient and accurate exchange of information on what substances are in regulated products. Instead of relying on names, which vary across regulatory domains, countries, and regions, the GSRS knowledge base makes it possible for substances to be defined by standardized, scientific descriptions. | |
Explanation | Unless otherwise noted, the contents of the FDA website (www.fda.gov), both text and graphics, are not copyrighted. They are in the public domain and may be republished, reprinted and otherwise used freely by anyone without the need to obtain permission from FDA. Credit to the U.S. Food and Drug Administration as the source is appreciated but not required. | |
Record name | GALANTAMINE | |
Source | Hazardous Substances Data Bank (HSDB) | |
URL | https://pubchem.ncbi.nlm.nih.gov/source/hsdb/7361 | |
Description | The Hazardous Substances Data Bank (HSDB) is a toxicology database that focuses on the toxicology of potentially hazardous chemicals. It provides information on human exposure, industrial hygiene, emergency handling procedures, environmental fate, regulatory requirements, nanomaterials, and related areas. The information in HSDB has been assessed by a Scientific Review Panel. | |
Record name | Galantamine | |
Source | Human Metabolome Database (HMDB) | |
URL | http://www.hmdb.ca/metabolites/HMDB0014812 | |
Description | The Human Metabolome Database (HMDB) is a freely available electronic database containing detailed information about small molecule metabolites found in the human body. | |
Explanation | HMDB is offered to the public as a freely available resource. Use and re-distribution of the data, in whole or in part, for commercial purposes requires explicit permission of the authors and explicit acknowledgment of the source material (HMDB) and the original publication (see the HMDB citing page). We ask that users who download significant portions of the database cite the HMDB paper in any resulting publications. | |
Melting Point |
126-127 °C, 269 - 270 °C (hydrogen bromide salt) | |
Record name | GALANTAMINE | |
Source | Hazardous Substances Data Bank (HSDB) | |
URL | https://pubchem.ncbi.nlm.nih.gov/source/hsdb/7361 | |
Description | The Hazardous Substances Data Bank (HSDB) is a toxicology database that focuses on the toxicology of potentially hazardous chemicals. It provides information on human exposure, industrial hygiene, emergency handling procedures, environmental fate, regulatory requirements, nanomaterials, and related areas. The information in HSDB has been assessed by a Scientific Review Panel. | |
Record name | Galantamine | |
Source | Human Metabolome Database (HMDB) | |
URL | http://www.hmdb.ca/metabolites/HMDB0014812 | |
Description | The Human Metabolome Database (HMDB) is a freely available electronic database containing detailed information about small molecule metabolites found in the human body. | |
Explanation | HMDB is offered to the public as a freely available resource. Use and re-distribution of the data, in whole or in part, for commercial purposes requires explicit permission of the authors and explicit acknowledgment of the source material (HMDB) and the original publication (see the HMDB citing page). We ask that users who download significant portions of the database cite the HMDB paper in any resulting publications. | |
Synthesis routes and methods I
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Synthesis routes and methods II
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Retrosynthesis Analysis
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