The molecule is a cyclic trinucleotide that consists of two AMP and one GMP units cyclised via 3',5'-linkages, major species at pH 7.3.
2-amino-9-[(1S,6R,8R,9R,10S,15R,17R,18R,19S,24R,26R,27R)-17,26-bis(6-aminopurin-9-yl)-9,18,27-trihydroxy-3,12,21-trioxido-3,12,21-trioxo-2,4,7,11,13,16,20,22,25-nonaoxa-3lambda5,12lambda5,21lambda5-triphosphatetracyclo[22.3.0.06,10.015,19]heptacosan-8-yl]-1H-purin-6-one