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