compound 19 [PMID: 35142215]   Click here for help

GtoPdb Ligand ID: 11903

Compound class: Synthetic organic
Comment: This compound was discovered as a noncovalent coronavirus Mpro inhibitor in a virtual screening campaign of >200 million fragments, followed by crystallographic screening and hit-to-lead optimisation [1]. Binding to the SARS-CoV-2 Mpro and inhibition of its protease activity were confirmed in in vitro assays.
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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 5
Hydrogen bond donors 1
Rotatable bonds 2
Topological polar surface area 62.3
Molecular weight 377.09
XLogP 3.49
No. Lipinski's rules broken 0
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 O=C1NC2(C(=O)N1c1cncc3c1cccc3)CC(C2)c1ccccc1Cl
Isomeric SMILES Clc1c(cccc1)C1CC2(C1)NC(=O)N(C2=O)c1c2ccccc2cnc1
InChI InChI=1S/C21H16ClN3O2/c22-17-8-4-3-6-15(17)14-9-21(10-14)19(26)25(20(27)24-21)18-12-23-11-13-5-1-2-7-16(13)18/h1-8,11-12,14H,9-10H2,(H,24,27)
InChI Key XQFMLNUPNCXPRN-UHFFFAOYSA-N
Bioactivity Comments
Compound 19 did not inhibit a set of human proteases (cathepsins K, D, B, L, thrombin, caspase-2, elastase, calpain 1, trypsin), and its cytotoxicity was low against human Vero E6 and Huh7 cells [1]. It inhibits SARS-CoV-2 replication in Vero E6 cells with an EC50 of 44 nM.
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
CoV 3C-like (main) protease SARS-CoV-2 Inhibitor Inhibition 7.4 pKd - 1
⤷ pKd 7.4 (Kd 3.8x10-8 M) [1]
Description: Binding affinity
CoV 3C-like (main) protease SARS-CoV-2 Inhibitor Inhibition 7.1 pIC50 - 1
⤷ pIC50 7.1 (IC50 7.7x10-8 M) [1]
Description: Inhibtion of protease activity