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In compounds of Formula 1, R can be selected from halogen, N R, NR OR, NO, NO, OH, C alkyl, C alkoxy, C alkylsulfanyl, C alkylsulfinyl, C fluoroalkyl, C fluoroalkoxy, C cycloalkyl, C cycloalkyloxy, and a chemotherapeutic moiety; wherein each R is independently selected from hydrogen and C alkyl, or two R together with the nitrogen to which they are bonded form a 3 to 5 membered heterocyclic ring; and R can be hydrogen active ingredient in viagra