8- Bromo- β- phenyl- 1, N²- ethenoguanosine- 3', 5'-cyclic monophosphate ( 8-Br-PET-cGMP ), sodium salt
8- (3- Butynylthio)guanosine- 3', 5'- cyclic monophosphate ( 8-Bu(3-yne)T-cGMP ), sodium salt
8- (4- Chlorophenylthio)- N6- phenyladenosine- 3', 5'- cyclic monophosphate ( 8-CPT-6-Phe-cAMP ), sodium salt