[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a cyclic pyrimidine dinucleotide that consists of two UMP units cyclised via 3',5'-linkages, major species at pH 7.3. It is an organophosphate oxoanion and a cyclic pyrimidine dinucleotide."}, {"from": "gpt", "value": "[C][C@@H1][C@H1][Branch2][Ring1][Branch2][C@H1][Branch2][Ring1][Ring1][C@@H1][Branch1][Ring2][O][Ring1][Branch1][N][C][=C][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][O][O][P][=Branch1][C][=O][Branch2][Ring2][O][O][C][C@@H1][C@H1][Branch2][Ring1][Branch2][C@H1][Branch2][Ring1][Ring1][C@@H1][Branch1][Ring2][O][Ring1][Branch1][N][C][=C][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][O][O][P][=Branch1][C][=O][Branch1][Branch1][O][Ring2][Ring2][=Branch1][O-1][O-1]"}]