The molecule is a dinucleotide comprising adenosine and guanosine connected by a 3'->5 linkage and with a phosphoric group at the 5'-terminus; major species at pH 7.3.
[(2R,3S,4R,5R)-3-[[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl]oxy-5-(6-aminopurin-9-yl)-4-hydroxyoxolan-2-yl]methyl phosphate