CP-199330 is a cysteyl LT1 receptor antagonist with no hepatotoxicity and is equivalent to the commercially available CYSLT1 receptor antagonists Zafirlukast and Pranlukas.
Dihydro montelukast is a potential impurity found in commercial montelukast preparations. Montelukast (sodium salt) is a potent and selective cysteinyl leukotriene 1 (CysLT1) receptor antagonist. Formulations containing montelukast are used for the treatment of asthma as well as for the symptoms associated with allergic rhinitis.