The molecule is cyclic tetraadenylate; major species at pH 7.3. It is an adenyl ribonucleotide, a cyclic oligonucleotide and an organophosphate oxoanion.
(1S,6R,8R,9R,10S,15R,17R,18R,19S,24R,26R,27R,28S,33R,35R,36R)-8,17,26,35-tetrakis(6-aminopurin-9-yl)-3,12,21,30-tetraoxido-3,12,21,30-tetraoxo-2,4,7,11,13,16,20,22,25,29,31,34-dodecaoxa-3lambda5,12lambda5,21lambda5,30lambda5-tetraphosphapentacyclo[31.3.0.06,10.015,19.024,28]hexatriacontane-9,18,27,36-tetrol