Standards; Pharmaceutical/API Drug Impurities/Metabolites;
Desethyl Sildenafil (Sildenafil EP Impurity C) is a metabolite of Sildenafil (S435000), an orally active selective type 5 cGMP phosphodiesterase inhibitor.
Terrett, N.K., et al.: Bioorg. Med. Chem. Lett., 6, 1819 (1996); Goldstein, I., et al.: N. Engl. J. Med., 338, 1397 (1998)