N6- (6- Aminohexyl)adenosine- 3', 5'- cyclic monophosphorothioate, Sp- isomer, immobilized on agarose gel (Sp-6-AH-cAMPS-Agarose)[N6- (6- Aminohexyl)adenosine- 3', 5'- cyclic monophosphorothioate, Sp- isomer, immobilized on agarose gel (Sp-6-AH-cAMPS-Agarose)]