Sildenafil Citrate Price Not Available Sildenafil Citrate Supplier Page Trivial name Sildenafil Citrate Catalog Number A0163 Research Area pharmaceutical Molecular Formula C28H38N6O11S CAS# 171599-83-0 Purity 98% SMILES O=C1C(N(C)N=C2CCC)=C2N=C(C3=CC(S(=O)(N4CCN(C)CC4)=O)=CC=C3OCC)N1.O=C(CC(C(O)=O)(O)CC(O)=O)O Supplier Page http://www.rosewellchem.com/1078-cas-171599-83-0.html