| 5',3'-ApC, ApC | Adenylyl-3',5'-cytidine |
| 5',3'-GpC, GpC | Guanylyl-3',5'-cytidine |
| 3'-AMP | Adenosine-3'-phosphate |
| 3'-GMP | Guanosine-3'-phosphate |
| 2',3'-cAMP, cAMP | Adenosine-2',3'-phosphodiester |
| 2',3'-cGMP, cGMP | Guanosine-2',3'-phosphodiester |
| A | Adenosine |
| C | Cytidine |
| G | Guanosine |
| U | Uracil |
| N | any nucleoside |
| p | phosphate group |