8- (6- Aminohexylamino)- 2'- O- methyladenosine- 3', 5'- cyclic monophosphate, immobilized on agarose gel (8-AHA-2'-O-Me-cAMP-Agarose)[8- (6- Aminohexylamino)- 2'- O- methyladenosine- 3', 5'- cyclic monophosphate, immobilized on agarose gel (8-AHA-2'-O-Me-cAMP-Agarose)]