The molecule is an organophosphate oxoanion obtained by deprotonation of the phospohate OH groups of pApA. Major microspecies at pH 7.3. It is a conjugate base of a pApA.
[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl]oxy-4-hydroxyoxolan-2-yl]methyl phosphate