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Chemical Component Summary

Identifiers2-[1-[[(1R)-1-[3-[(E)-2-(7-chloroquinolin-2-yl)ethenyl]phenyl]-3-[2-(2-hydroxypropan-2-yl)phenyl]propyl]sulfanylmethyl]cyclopropyl]ethanoic acid
FormulaC35 H36 Cl N O3 S
Molecular Weight586.18 g/mol
Isomeric SMILESCC(C)(O)c1ccccc1CC[C@@H](SCC1(CC(O)=O)CC1)c1cccc(\C=C\c2ccc3ccc(Cl)cc3n2)c1

Chemical Details

Formal Charge0
Atom Count77
Chiral Atom Count1
Chiral AtomsCBM
Bond Count81
Aromatic Bond Count23
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00471 Different stereochemistry
DescriptionMontelukast is a leukotriene receptor antagonist (LTRA) used for the maintenance treatment of asthma and to relieve symptoms of seasonal allergies. It is usually administered orally. Montelukast blocks the action of leukotriene D4 on the cysteinyl leukotriene receptor CysLT1 in the lungs and bronchial tubes by binding to it. This reduces the bronchoconstriction otherwise caused by the leukotriene, and results in less inflammation. Because of its method of operation, it is not useful for the treatment of acute asthma attacks. Again because of its very specific locus of operation, it does not interact with other allergy medications such as theophylline. Montelukast is marketed in United States and many other countries by Merck & Co. with the brand name Singulair®. It is available as oral tablets, chewable tablets, and oral granules. In India and other countries, it is also marketed under the brand name Montair®, produced by Indian company Cipla.
  • (R-(e))-1-(((1-(3-(2-(7-Chloro-2-quinolinyl)ethenyl)phenyl)-3-(2-(1-hydroxy-1-methylethyl)phenyl)propyl)thio)methyl)cyclopropaneacetic acid
  • 1-[[[(1 R)-1-[3-[(1e)-2-(7-chloro-2-Quinolinyl)ethenyl] phenyl]-3-[2-(1-hydroxy-1-methylethyl)phenyl]propyl]sulfanyl]methyl]cyclopropaneacetic acid
  • Montelukast
  • Montélukast
  • Montelukastum
SaltsMontelukast sodium
Brand Names
  • Accel-montelukast Sodium Tablets
  • Ach-montelukast
  • Apo-montelukast
  • Auro-montelukast
  • Auro-montelukast C
Affected OrganismHumans and other mammals
IndicationFor the treatment of asthma
PharmacologyMontelukast, like zafirlukast, is a leukotriene receptor antagonist used as an alternative to anti-inflammatory medications in the management and chronic treatment of asthma and exercise-induced bronchospasm (EIB). Unlike zafirlukast, montelukast does not inhibit CYP2C9 or CYP3A4 and is, therefore, not expected to affect the hepatic clearance of drugs metabolized by these enzymes.
Mechanism of actionMontelukast selectively antagonizes leukotriene D<sub>4</sub> (LTD<sub>4</sub>) at the cysteinyl leukotriene receptor, CysLT<sub>1</sub>, in the human airway. Montelukast inhibits the actions of LTD<sub>4</sub> at the CysLT<sub>1</sub> receptor, preventing airway edema, smooth muscle contraction, and enhanced secretion of thick, viscous mucus.
Route of administrationOral
  • Acids, Acyclic
  • Agents to Treat Airway Disease
  • Anti-Asthmatic Agents
  • Carboxylic Acids
  • Chemical Actions and Uses
  • R03DC53
  • R03DC03
CAS number158966-92-8
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682