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vustanaciclib   Click here for help

GtoPdb Ligand ID: 14368

Synonyms: example 3 [US20240033264] | GDC-4198 | RGT-419B
Compound class: Synthetic organic
Comment: The chemical structure for this compound was obtained from WHO INN proposed list 134 (Feb 2026), in which it is described as a cyclin dependent kinase inhibitor with antineoplastic potential. The structure is claimed in patent US20240033264 [1], that was transferred from Regor Pharmaceuticals to Genentech (Roche). Based on this evidence vustanaciclib might be the INN for the lead CDK4/2 inhibitor RGT-419B (new code GDC-4198), that is in development for advanced/metastatic breast cancer that is insensitive to exisiting CDK4/6 inhibitors.
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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 9
Hydrogen bond donors 1
Rotatable bonds 6
Topological polar surface area 88.26
Molecular weight 470.57
XLogP 0.56
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 CC(C)C1=C2C=C(C=CN2N=C1)C3=NC(=NC=C3)NC4=CC=C(C=N4)N5CC[C@@H](CC5=O)N(C)C
Isomeric SMILES CC(C)C1=C2C=C(C=CN2N=C1)C3=NC(=NC=C3)NC4=NC=C(C=C4)N5CC[C@@H](CC5=O)N(C)C
InChI InChI=1S/C26H30N8O/c1-17(2)21-16-29-34-12-8-18(13-23(21)34)22-7-10-27-26(30-22)31-24-6-5-20(15-28-24)33-11-9-19(32(3)4)14-25(33)35/h5-8,10,12-13,15-17,19H,9,11,14H2,1-4H3,(H,27,28,30,31)/t19-/m0/s1
InChI Key QZJWVFBTMGPBPY-IBGZPJMESA-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
GDC-4198 (RGT-419B) was progressed to clinical trials to determine safety and efficacy against select advanced/metastatic breast cancers.
Clinical Trials
Clinical Trial ID Title Type Source Comment References
NCT05304962 FIH Study of RGT-419B Alone and With Endocrine Therapy in HR-Positive, HER2-Negative Advanced/Metastatic Breast Cancer Phase 1 Interventional Regor Pharmaceuticals Inc.
NCT06299124 A Phase I Study of RGT-419B in Patients With HR-Positive, HER2-Negative Advanced Breast Cancer or Other Solid Tumors Phase 1 Interventional Regor Pharmaceuticals Inc.
NCT07100106 A Study to Evaluate the Effect of GDC-4198 Alone and in Combination With Giredestrant Versus Abemaciclib and Giredestrant in Participants With Locally Advanced or Metastatic Estrogen Receptor-Positive (ER+), Human Epidermal Growth Factor Receptor-Negative (HER2-) Breast Cancer Phase 1/Phase 2 Interventional Genentech, Inc.