[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a single-stranded DNA polynucleotide consisting of a repeating unit of brominated deoxyguanosine and deoxycytidine residues, with all residues connected by 3'->5' phosphodiester linkages. The sites of bromination are at C-8 of guanine and C-5 of cytosine, although not all these sites are brominated, with bromination at the guanine C-8 predominating."}, {"from": "gpt", "value": "[C][C@@H1][Branch2][=Branch1][Branch2][C@H1][Branch2][Ring1][Ring2][O][C@H1][Ring1][Branch1][N][C][=C][Branch1][#Branch2][C][=Branch1][=Branch1][=N][C][Ring1][=Branch1][=O][N][Br][C][O][P][=Branch1][C][=O][Branch1][C][O][O][C@H1][C][C@@H1][Branch1][N][O][C@@H1][Ring1][Branch1][C][O][P][Branch1][C][O][O][N][C][=C][Branch1][=N][C][=Branch1][C][=O][N][C][=Branch1][Ring2][=N][Ring1][#Branch1][N][N][=C][Ring1][O][Br][O]"}]