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