SD-91   Click here for help

GtoPdb Ligand ID: 11599

Compound class: Synthetic organic
Comment: SD-91 is a selective PROTAC (proteolysis targeting chimaera) degrader of signal transducer and activator of transcription 3 (STAT3) [2]. It induces significant and long-lasting tumour regression in vivo. It is one of the chemical structures that are claimed as STAT3 degraders in patent WO2020198435A1 from The Regents Of The University Of Michigan [1]. SD-91 contains an inhibitor molecule that targets the STAT3 SH2 domain that is linked to a cereblon binding moiety that interacts with the cereblon/cullin 4A E3 ligase to promote proteosomal degradation.
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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 21
Hydrogen bond donors 8
Rotatable bonds 23
Topological polar surface area 337.69
Molecular weight 1135.42
XLogP 3.03
No. Lipinski's rules broken 3
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 NC(=O)CC[C@@H](C(=O)NC(c1ccccc1)c1ccccc1)NC(=O)[C@@H]1CC[C@H]2N1C(=O)[C@H](CN(CC2)C(=O)CCCCCC#Cc1cccc2c1CN(C2=O)C1CCC(=O)NC1=O)NC(=O)c1cc2c([nH]1)ccc(c2)C(=O)P(=O)(O)O
Isomeric SMILES NC(=O)CC[C@@H](C(=O)NC(c1ccccc1)c1ccccc1)NC(=O)[C@@H]1CC[C@H]2N1C(=O)[C@H](CN(CC2)C(=O)CCCCCC#Cc1cccc2c1CN(C2=O)C1CCC(=O)NC1=O)NC(=O)c1cc2c([nH]1)ccc(c2)C(=O)P(=O)(O)O
InChI InChI=1S/C59H62N9O13P/c60-49(69)27-24-44(53(72)65-52(36-14-7-4-8-15-36)37-16-9-5-10-17-37)62-56(75)48-25-22-40-29-30-66(34-46(58(77)68(40)48)63-54(73)45-32-39-31-38(21-23-43(39)61-45)59(78)82(79,80)81)51(71)20-11-3-1-2-6-13-35-18-12-19-41-42(35)33-67(57(41)76)47-26-28-50(70)64-55(47)74/h4-5,7-10,12,14-19,21,23,31-32,40,44,46-48,52,61H,1-3,11,20,22,24-30,33-34H2,(H2,60,69)(H,62,75)(H,63,73)(H,65,72)(H,64,70,74)(H2,79,80,81)/t40-,44+,46+,47?,48+/m1/s1
InChI Key OHDMEJTVYXXZNQ-OPKPGBGESA-N
Selectivity at other protein targets
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
signal transducer and activator of transcription 3 Hs Inhibitor Binding 7.6 pKd - 2
⤷ pKd 7.6 (Kd 2.8x10-8 M) [2]
Description: Determined in a biolayer interferometry (BLI) assay
signal transducer and activator of transcription 3 Hs Inhibitor Binding 8.3 pKi - 2
⤷ pKi 8.3 (Ki 5.5x10-9 M) [2]
Description: Determined in a competitive fluorescence-polarization assay