1) Cat. No.: TRC-D289600; 2) Chemical Name: Desethyl Sildenafil; 3) CAS No.: 139755-91-2; 4) Mol. Formula: C20H26N6O4S; 5) Mol. Weight: 446.52; 6) Packing Size: 2.5mg / 25mg; 7) Appearence: Off-White Solid; 8) Application Notes: A metabolite of Sildenafil (S435000), an orally active selective type 5 cGMP phosphodiesterase inhibitor.; 9) Synonym: 5-[2-Hydroxy-5-(4-methylpiperazinylsulphonyl)phenyl]1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyramidin-7-one; 5-[2-Hydroxy-5-[[4-(methyl)-1-piperazinyl]sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one;; 10) Solubility: Aqueous Base, DMSO (Sparingly); 11) Storage condition: Refrigerator; 12) References: Terrett, N.K., et al.: Bioorg. Med. Chem. Lett., 6, 1819 (1996); Goldstein, I., et al.: N. Engl. J. Med., 338, 1397 (1998)