[{"from": "human", "value": "Please give me some details about this molecule. [C][C][=C][N][C@H1][C][C@@H1][Branch2][Branch1][=N][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][O][P][=Branch1][C][=O][Branch2][Ring2][=N][O][C@H1][C][C@H1][Branch2][Ring1][#C][N][C@@H1][Branch1][O][C][Ring2][Ring1][Ring1][=N][C][Ring2][Ring1][Ring1][=O][C@@][Branch1][#Branch2][C][=Branch1][C][=O][N][C][Ring1][O][=O][Branch1][C][C][O][O][C@@H1][Ring2][Ring1][Ring1][C][O][O][O]"}, {"from": "gpt", "value": "The molecule is a single-stranded DNA oligonucleotide consisting of two thymidine molecules linked (3'->5') and also with a C6-C4 bond. It results from irradiation at 254 nm of normal dTpT (PDB entry: 1EHL)."}]