2'- O- (6- Aminohexylcarbamoyl)adenosine- 3', 5'- cyclic monophosphorothioate, Sp- isomer, immobilized on agarose gel (Sp-2'-AHC-cAMPS-Agarose)[2'- O- (6- Aminohexylcarbamoyl)adenosine- 3', 5'- cyclic monophosphorothioate, Sp- isomer, immobilized on agarose gel (Sp-2'-AHC-cAMPS-Agarose)]