N2- (6- Aminohexyl)guanosine- 3', 5'- cyclic monophosphate ( 2-AH-cGMP )
N6- (6- Aminohexyl)adenosine- 3', 5'- cyclic monophosphorothioate, Sp- isomer ( Sp-6-AH-cAMPS )
N6- (2- Aminoethyl)adenosine- 3', 5'- cyclic monophosphorothioate, Sp- isomer ( Sp-6-AE-cAMPS )