semagacestat   Click here for help

GtoPdb Ligand ID: 6978

Synonyms: LY-450139
PDB Ligand
Compound class: Synthetic organic
Comment: Semagacestat is a small-molecule γ-secretase inhibitor that was developed by Eli Lilly as a potential treatment for Alzheimer's disease but it failed in Phase 3 clinical trials. NOTCH is also a γ-secretase substrate [3], and on-target inhibition of NOTCH receptor-related signalling by semagacestat treatment is proposed to be (at least in part) responsible for the unacceptable side effects that were noted in clinical trials, and which lead to termination of the trials [1].
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Ligand Activity Visualisation Charts

These are box plot that provide a unique visualisation, summarising all the activity data for a ligand taken from ChEMBL and GtoPdb across multiple targets and species. Click on a plot to see the median, interquartile range, low and high data points. A value of zero indicates that no data are available. A separate chart is created for each target, and where possible the algorithm tries to merge ChEMBL and GtoPdb targets by matching them on name and UniProt accession, for each available species. However, please note that inconsistency in naming of targets may lead to data for the same target being reported across multiple charts.

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View interactive charts of activity data across species

semagacestat is commercially available from our sponsors

2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the CDK toolkit. All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 7
Hydrogen bond donors 3
Rotatable bonds 7
Topological polar surface area 98.74
Molecular weight 361.2
XLogP 0.72
No. Lipinski's rules broken 0
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

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Canonical SMILES O=C(C(NC(=O)C(C(C)C)O)C)NC1C(=O)N(C)CCc2c1cccc2
Isomeric SMILES O=C([C@@H](NC(=O)[C@H](C(C)C)O)C)N[C@@H]1C(=O)N(C)CCc2c1cccc2
InChI InChI=1S/C19H27N3O4/c1-11(2)16(23)18(25)20-12(3)17(24)21-15-14-8-6-5-7-13(14)9-10-22(4)19(15)26/h5-8,11-12,15-16,23H,9-10H2,1-4H3,(H,20,25)(H,21,24)/t12-,15-,16-/m0/s1
InChI Key PKXWXXPNHIWQHW-RCBQFDQVSA-N
No information available.
Summary of Clinical Use Click here for help
The Phase 3 trial was stopped because, compared with placebo, semagacestat did not improve cognitive status and patients receiving the higher dose had significant worsening of functional ability. [1]