The molecule is an organophosphate oxoanion obtained by deprotonation of the phosphate OH groups of 2'-3'-cGAMP; major species at pH 7.3. It derives from a Gp[2'-5']Ap[3'](3-). It is a conjugate base of a 2'-3'-cGAMP.
2-amino-9-[(1R,6R,8R,9R,10S,15R,17R,18R)-8-(6-aminopurin-9-yl)-9,18-dihydroxy-3,12-dioxido-3,12-dioxo-2,4,7,11,13,16-hexaoxa-3lambda5,12lambda5-diphosphatricyclo[13.2.1.06,10]octadecan-17-yl]-1H-purin-6-one