WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 317105

CAS#: 1232861-58-3 (free acid)

Description: Gemilukast, also known as ONO-6950, is an orally active dual CysLT1 and CysLT2 antagonist. Gemilukast exhibited antagonist activities with IC50 values of 1.7 and 25 nM against human CysLT1 and human CysLT2, respectively, and potent efficacy at an oral dose of 0.1 mg/kg given 24 h before LTD4 challenge in a CysLT1-dependent guinea pig asthmatic model. In addition, gemilukast dose-dependently reduced LTC4-induced bronchoconstriction in both CysLT1- and CysLT2-dependent guinea pig asthmatic models, and it reduced antigen-induced constriction of isolated human bronchi. Gemilukast is currently being evaluated in phase II trials for the treatment of asthma.

Chemical Structure

CAS# 1232861-58-3 (free acid)

Theoretical Analysis

MedKoo Cat#: 317105
Name: Gemilukast
CAS#: 1232861-58-3 (free acid)
Chemical Formula: C36H37F2NO5
Exact Mass: 601.26398
Molecular Weight: 601.69
Elemental Analysis: C, 71.86; H, 6.20; F, 6.32; N, 2.33; O, 13.30

Price and Availability

Size Price Availability Quantity
Bulk inquiry

Related CAS #: 1232861-58-3 (free acid)   1232861-64-1 (disodium)   1232873-69-6 (8 hydrate and disodium)    

Synonym: ONO-6950; ONO 6950; ONO6950; Gemilukast.

IUPAC/Chemical Name: 4,4'-(4-fluoro-7-((4-(4-(3-fluoro-2-methylphenyl)butoxy)phenyl)ethynyl)-2-methyl-1H-indole-1,3-diyl)dibutyric acid


InChi Code: InChI=1S/C36H37F2NO5/c1-24-27(9-5-11-31(24)37)8-3-4-23-44-29-19-15-26(16-20-29)14-17-28-18-21-32(38)35-30(10-6-12-33(40)41)25(2)39(36(28)35)22-7-13-34(42)43/h5,9,11,15-16,18-21H,3-4,6-8,10,12-13,22-23H2,1-2H3,(H,40,41)(H,42,43)


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO, not in water

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 601.69 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

Molarity Calculator

Calculate the mass, volume, or concentration required for a solution.

*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Dilution Calculator

Calculate the dilution required to prepare a stock solution.