The molecule is a cyclic pyrimidine dinucleotide that consists of CMP and UMP units cyclised via 3',5'-linkages, major species at pH 7.3.
1-[(1S,6R,8R,9R,10S,15R,17R,18R)-17-(4-amino-2-oxopyrimidin-1-yl)-9,18-dihydroxy-3,12-dioxido-3,12-dioxo-2,4,7,11,13,16-hexaoxa-3lambda5,12lambda5-diphosphatricyclo[13.3.0.06,10]octadecan-8-yl]pyrimidine-2,4-dione