The molecule is a linear 5'-hydroxy-diadenylate with a cyclic 2',3' phosphate terminus; major species at pH 7.3. It is an adenyl ribonucleotide, a cyclic oligonucleotide and an organophosphate oxoanion.
[(3aR,4R,6R,6aR)-4-(6-aminopurin-9-yl)-2-oxido-2-oxo-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3,2]dioxaphosphol-6-yl]methyl [(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-4-hydroxy-2-(hydroxymethyl)oxolan-3-yl] phosphate