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Montelukast DESCRIPTION From our sponsors: . From our sponsors: Montelukast sodium is a selective and orally active leukotriene receptor antagonist that inhibits the cysteinyl leukotriene CysLT1 receptor. Montelukast sodium is described chemically as -1- phenyl]-3- propyl]thio]methyl]cyclopropaneacetic acid, monosodium salt. The empirical formula is C35H35ClNNaO3S, and its molecular weight is ...