N-Desmethyl Sildenafil Price Not Available 25mg N-Desmethyl Sildenafil Supplier Page Catalog Number R004323 Molecular Formula C21H28N6O4S CAS# 139755-82-1 Purity ≥90% Inchi InChI=1S/C21H28N6O4S/c1-4-6-16-18-19(26(3)25-16)21(28)24-20(23-18)15-13-14(7-8-17(15)31-5-2)32(29,30)27-11-9-22-10-12-27/h7-8,13,22H,4-6,9-12H2,1-3H3,(H,23,24,28) Inchi Key UZTKBZXHEOVDRL-UHFFFAOYSA-N SMILES CCCC1=NN(C2=C1NC(=NC2=O)C3=C(C=CC(=C3)S(=O)(=O)N4CCNCC4)OCC)C Size 25mg Supplier Page https://www.musechem.com/product/R004323.html