Omaciclovir and its Impurities

Omaciclovir is a prodrug of penciclovir with higher oral bioavailability. It is marketed as Famvir by Novartis, is a guanine analogue used to treat herpes virus infections. It is most commonly used to treat herpes zoster. Reference standards of Omaciclovir API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.