laniquidar   Click here for help

GtoPdb Ligand ID: 11789

Compound class: Synthetic organic
Comment: Laniquidar (R101933) is a third generation inhibitor of the ATP-binding cassette transporter P-glycoprotein (P-gp; ABCB1) [1-2]. P-gp is a drug transporter and efflux pump that can promote resistance to drugs, including chemotherapeutics. Pharmacologic inhibition of P-gp is an established strategy that is being investigated to block this resistance mechanism in cancers [1].
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 5
Hydrogen bond donors 0
Rotatable bonds 8
Topological polar surface area 69.48
Molecular weight 584.28
XLogP 6.37
No. Lipinski's rules broken 1
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 COC(=O)c1cnc2n1CCc1c(C2=C2CCN(CC2)CCc2ccc(cc2)OCc2ccc3c(n2)cccc3)cccc1
Isomeric SMILES COC(=O)c1cnc2n1CCc1ccccc1C2=C1CCN(CC1)CCc1ccc(cc1)OCc1nc2ccccc2cc1
InChI InChI=1S/C37H36N4O3/c1-43-37(42)34-24-38-36-35(32-8-4-2-6-27(32)19-23-41(34)36)29-17-21-40(22-18-29)20-16-26-10-14-31(15-11-26)44-25-30-13-12-28-7-3-5-9-33(28)39-30/h2-15,24H,16-23,25H2,1H3
InChI Key TULGGJGJQXESOO-UHFFFAOYSA-N
No information available.
Summary of Clinical Use Click here for help
Laniquidar (R101933) was advanced to clinical evaluation as an adjuvant to chemotherapy in breast cancer patients, reaching phase 2 study. Trials in patients with haematologic cancers were also carried out. Development was discontinued because of the compound's low bioavailability, and an unacceptably high inter-patient response to treatment was detected.
Clinical Trials
Clinical Trial ID Title Type Source Comment References
NCT00028873 R101933 Combined With Chemotherapy in Treating Patients With Metastatic Breast Cancer That Has Not Responded to Previous Chemotherapy Phase 2 Interventional European Organisation for Research and Treatment of Cancer - EORTC