2'- O- (2- Aminoethylcarbamoyl)cytidine- 3', 5'- cyclic monosposphate, immobilized on agarose gel (2'-AHC-cCMP-Agarose)[2'- O- (2- Aminoethylcarbamoyl)cytidine- 3', 5'- cyclic monosposphate, immobilized on agarose gel (2'-AHC-cCMP-Agarose)]