voxelotor   Click here for help

GtoPdb Ligand ID: 10559

Synonyms: compound 36 [PMID: 28337324] | GBT-440 | GBT440 | Oxbryta®
Approved drug
voxelotor is an approved drug (FDA (2019), EMA (2022))
Compound class: Synthetic organic
Comment: Voxelotor (GBT440) is an orally bioavailable drug that acts allosterically to stabilise the relaxed (R)-state of sickle cell haemoglobin (HbS) in which it has high affinity for oxygen, and this mechanism reduces the HbS polymerisation that drives erythrocyte sickling [1].
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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 3
Hydrogen bond donors 1
Rotatable bonds 6
Topological polar surface area 77.24
Molecular weight 337.14
XLogP 3.61
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=Cc1c(cccc1O)OCc1cccnc1c1ccnn1C(C)C
Isomeric SMILES O=Cc1c(cccc1O)OCc1cccnc1c1ccnn1C(C)C
InChI InChI=1S/C19H19N3O3/c1-13(2)22-16(8-10-21-22)19-14(5-4-9-20-19)12-25-18-7-3-6-17(24)15(18)11-23/h3-11,13,24H,12H2,1-2H3
InChI Key FWCVZAQENIZVMY-UHFFFAOYSA-N
Bioactivity Comments
Voxelotor increases HbS' in vitro oxygen affinity with a Δp50 of 72% [1]. Δp50 represents the % change from baseline of pO2 at which HbS (at 25 μM) is 50% saturated with O2 in the presence of test compound at 30 μM. It delays HbS polymerisation by >200% compared to baseline.
Despite in vitro inhbitory action on some of the major human liver CYP450 isozymes, the partitioning of voxelotor in to the red blood cell compartment is predicted to mitigate against metabolism and possible drug-drug interactions.
Selectivity at enzymes
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
CYP2C8 Hs Inhibitor Inhibition 5.1 pIC50 - 1
⤷ pIC50 5.1 (IC50 7.9x10-6 M) [1]
Description: Measuring inhibition of CYP2C8 activity using paclitaxel as substrate.
CYP2C9 Hs Inhibitor Inhibition 5.1 pIC50 - 1
⤷ pIC50 5.1 (IC50 8.5x10-6 M) [1]
Description: Measuring inhibition of CYP2C9 activity using tolbutamide as substrate.
CYP3A4 Hs Inhibitor Inhibition 4.9 pIC50 - 1
⤷ pIC50 4.9 (IC50 1.25x10-5 M) [1]
Description: Measuring inhibition of CYP3A4 activity using testosterone as substrate.