derquantel and its Impurities

Derquantel is an antiparasitic active ingredient used in veterinary medicine. It is used in sheep against some internal parasites (mainly roundworms). It is not used against agricultural and household pests. It belongs to the chemical class of the spiroindoles. Reference standards of Derquantel API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.