Montelukast tert butylamine and its Impurities

Montelukast tert butylamine sold under the trade name Singulair. It is used to prevent and manage asthma symptoms and to relieve the symptoms of seasonal allergies, also known as seasonal allergic rhinitis or hay fever. Reference standards of Montelukast Tert Butylamine API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.