2'- O- (6- Aminohexylcarbamoyl)adenosine- 3', 5'- cyclic monophosphate, immobilized on agarose gel (2'-AHC-cAMP-Agarose)[2'- O- (6- Aminohexylcarbamoyl)adenosine- 3', 5'- cyclic monophosphate, immobilized on agarose gel (2'-AHC-cAMP-Agarose)]