[{"from": "human", "value": "Provide a description of this molecule. [C][C][=C][N][Branch1][#Branch2][C][=Branch1][C][=O][N][C][Ring1][#Branch1][=O][C@H1][C][C@@H1][Branch1][P][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][O][P][=Branch1][C][=O][Branch1][C][O][O][O][P][=Branch1][C][=O][Branch1][C][O][O][C][C@@H1][C@H1][Branch2][Ring1][#Branch1][C][C@@H1][Branch1][Ring2][O][Ring1][Branch1][N][C][=C][Branch1][#Branch2][C][=Branch1][=Branch1][=N][C][Ring1][=Branch1][=O][N][C][O]"}, {"from": "gpt", "value": "The molecule is a single-stranded DNA polynucleotide consisting of a repeating unit of thymidine and 5-methyldeoxycytidine residues, with all residues connected by 3'->5' phosphodiester linkages."}]