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indisulam   Click here for help

GtoPdb Ligand ID: 7046

Synonyms: E7070
PDB Ligand
Compound class: Synthetic organic
Comment: Indisulam is an anticancer sulfonamide that is in clinical development. This compound belongs to the family of carbonic anhydrase inhibitors. It also behaves as a type of molecular glue that targets certain proteins for ubiquitination and proteasomal degradation [1,3], by bringing them into the proximity the CUL4-DDB1-DDA1-DCAF15 E3 ubiquitin ligase complex.
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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

indisulam 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 Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/). 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 6
Hydrogen bond donors 3
Rotatable bonds 4
Topological polar surface area 138.88
Molecular weight 385
XLogP 1.9
No. Lipinski's rules broken 0

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
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.

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)

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Canonical SMILES Clc1c[nH]c2c1cccc2NS(=O)(=O)c1ccc(cc1)S(=O)(=O)N
Isomeric SMILES Clc1c[nH]c2c1cccc2NS(=O)(=O)c1ccc(cc1)S(=O)(=O)N
InChI InChI=1S/C14H12ClN3O4S2/c15-12-8-17-14-11(12)2-1-3-13(14)18-24(21,22)10-6-4-9(5-7-10)23(16,19)20/h1-8,17-18H,(H2,16,19,20)
InChI Key SETFNECMODOHTO-UHFFFAOYSA-N

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
Selectivity at enzymes
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
carbonic anhydrase 12 Hs Inhibitor Inhibition 8.5 pKi - 2
⤷ pKi 8.5 (Ki 3.4x10-9 M) [2]
carbonic anhydrase 1 Hs Inhibitor Inhibition 7.5 pKi - 2
⤷ pKi 7.5 (Ki 3.1x10-8 M) [2]
carbonic anhydrase 7 Hs Inhibitor Inhibition 6.9 pKi - 2
⤷ pKi 6.9 (Ki 1.22x10-7 M) [2]
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
RNA binding motif protein 39 Hs None Binding - - -
⤷ molecular glue degrader
Targets where the ligand is described in the comment field
Target Comment
RNA binding motif protein 39 in Spliceosome proteins
RNA binding motif protein 39 in RNA-binding proteins (RBPs)
 The RBM39 protein is a spliceosome component that has roles in steroid hormone receptor-mediated transcription and alternative splicing. It is a target of pharmaceutical interest based on its ability to modulate the alternative splicing of genes involved in cancer occurrence and progression. The aryl sulfonamides indisulam and tasisulam have been identified as molecular glue class degraders of RBM39. Next-generation RBM39 molecular glue degraders are in development pipelines, including REC-1245 (Recursion; phase 1/2 for advanced solid tumours), and ST-00937 and ST-01156 (Seed Therapeutics; for Ewing sarcoma and other solid tumours) - structures not disclosed as of September 2025.