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zavabresib   Click here for help

GtoPdb Ligand ID: 14065

Compound class: Synthetic organic
Comment: Zavabresib is the INN for a bromodomain and extra-terminal motif (BET) inhibitor with antineoplastic potential (WHO INN proposed list 133, 10th July 2025). The structure is claimed as P-001 in patent US20170081326 (Plexxikon Inc.) [3]. Daiichi Sankyo now own former Plexxikon assets including two BET inhibitors, PLX51107 and PLX2853. Since the structure of PLX51107 has been disclosed, and is not the same as zavabresib [4], we hypothesise that zavabresib will be the INN allocated for PLX2853.
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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 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 1
Rotatable bonds 6
Topological polar surface area 99.21
Molecular weight 515.56
XLogP 2.83
No. Lipinski's rules broken 1

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 CC1=NOC(=C1C2=CN=C3C(=CN(C3=C2)C(C)(C4=NC=CC=C4)C5=NC=CC=C5)C6=CC=C(C=C6)C(=O)O)C
Isomeric SMILES CC1=C(C(=NO1)C)C2=CC3=C(C(=CN3C(C)(C4=CC=CC=N4)C5=CC=CC=N5)C6=CC=C(C=C6)C(=O)O)N=C2
InChI InChI=1S/C31H25N5O3/c1-19-28(20(2)39-35-19)23-16-25-29(34-17-23)24(21-10-12-22(13-11-21)30(37)38)18-36(25)31(3,26-8-4-6-14-32-26)27-9-5-7-15-33-27/h4-18H,1-3H3,(H,37,38)
InChI Key LLUTURRCWNCHPC-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/)
No information available.
Summary of Clinical Use Click here for help
PLX2853 (known as OPN-2853 in Opna Bio's pipeline) was intended to treat advanced solid tumours and lymphomas [1-2]. Development appears to have been discontinued (August 2025), and clinical trials terminated.
Clinical Trials
Clinical Trial ID Title Type Source Comment References
NCT04493619 PLX2853 as a Single Agent in Advanced Gynecological Malignancies and in Combination With Carboplatin in Platinum-Resistant Epithelial Ovarian Cancer Phase 1/Phase 2 Interventional Opna Bio LLC
NCT04556617 PLX2853 in Combination With Abiraterone Acetate and Prednisone and in Combination With Olaparib in Subjects With Metastatic Castration-Resistant Prostate Cancer (mCRPC) Phase 1/Phase 2 Interventional Opna Bio LLC
NCT05677373 Testing the Safety and Effectiveness of Combining Two Drugs, PLX2853 and Trametinib in the Treatment of Advanced Uveal Melanoma Phase 1/Phase 2 Interventional Alliance for Clinical Trials in Oncology