2'- O- (N'- Methylanthraniloyl)uridine- 3', 5'- cyclic monophosphate, sodium salt ( MANT-cUMP )
8- Nitroguanosine- 3', 5'- cyclic monophosphate, sodium salt
8- Nitroxanthosine- 3', 5'- cyclic monophosphate ( 8-NO₂-cXMP ), sodium salt
N6- Phenyladenosine- 3', 5'- cyclic monophosphorothioate, Rp- isomer