STX-478   Click here for help

GtoPdb Ligand ID: 12903

Synonyms: STX478
PDB Ligand
Compound class: Synthetic organic
Comment: STX-478 (formerly ST-814; Scorpion Therapeutics) is an oral, CNS-penetrant PI3Kα allosteric inhibitor, that is intended for treatment of cancers with oncogenic PI3Kα mutations (e.g. H1047X substitutions).
The chemical structure shown here was revealed during the First Time Disclosures session at the ACS meeting in September 2023, and we picked it up from Drug Hunter. The discovery of STX-478 (including its structure) was formally disclosed in a Cancer Discovery article by Buckbinder et al. (2023) [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
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 6
Topological polar surface area 101.1
Molecular weight 401.29
XLogP 0.73
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 CC1=C([C@H](C(F)(F)F)NC(=O)NC2=CN=C(N)N=C2)OC3=C1C=C(C=C3F)F
Isomeric SMILES CC1=C(OC2=C1C=C(F)C=C2F)[C@@H](NC(=O)NC3=CN=C(N)N=C3)C(F)(F)F
InChI InChI=1S/C16H12F5N5O2/c1-6-9-2-7(17)3-10(18)12(9)28-11(6)13(16(19,20)21)26-15(27)25-8-4-23-14(22)24-5-8/h2-5,13H,1H3,(H2,22,23,24)(H2,25,26,27)/t13-/m1/s1
InChI Key LGPNQALKGDDVBD-CYBMUJFWSA-N
Bioactivity Comments
Additional PI3Kα inhibitors are claimed in Scorpion Therapeutics' 2023 patent WO2023018636A1 [2].
Selectivity at enzymes
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha Hs Inhibitor Inhibition 7.2 – 8.3 pKd - 1
⤷ pKd 8.3 (Kd 4.7x10-9 M) [1]
Description: Affinity for PI3Kα with the H1047R mutation
pKd 7.2 (Kd 7x10-8 M) [1]
Description: Affinity for wild type PI3Kα