N6- Phenyladenosine- 3', 5'- cyclic monophosphate ( 6-Phe-cAMP ), sodium salt
8- Bromo- β- phenyl- 1, N²- ethenoguanosine- 3', 5'-cyclic monophosphate ( 8-Br-PET-cGMP ), sodium salt
8- Nitroxanthosine- 3', 5'- cyclic monophosphate ( 8-NO₂-cXMP ), sodium salt
8- Nitroguanosine- 3', 5'- cyclic monophosphate, sodium salt
5'- O- Monobutyryladenosine- 2', 3'- cyclic monophosphate ( 5'-O-MB-2',3'-cAMP ), sodium salt