The molecule is a diadenosyl diphosphate having two 5'-adenosyl residues attached at the P(1)- and P(2)-positions of the diphosphate. It is a conjugate acid of a P(1),P(2)-bis(5'-adenosyl) diphosphate(2-).
[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl] [(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl hydrogen phosphate