[{"from": "human", "value": "Provide a description of this molecule. [C][C@@][Branch2][Branch2][=N][C@@H1][Branch2][Branch2][C][/C][=C][/C][=N][/C][=Branch2][=Branch1][Ring1][=C][\\C][=C][Branch2][Branch1][#Branch1][C][=Branch2][Ring2][N][=C][Branch1][Ring2][N][Ring1][Branch1][C][C][=C][Branch2][Ring1][=Branch2][C][=Branch1][S][=C][Branch1][Ring2][N][Ring1][Branch1][/C][=C][\\-Ring2][Ring1][Branch1][\\N][/-Ring2][Ring1][Ring2][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O][/C@H1][Branch1][=C][C@][Ring2][Ring2][=Branch1][Branch1][C][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is the second intermediate in the biosynthesis of vitamin B12 from uroporphyrinogen III, in which methyl groups have been introduced at positions 2 and 7 of the tetrapyrrole framework. It has a role as an Escherichia coli metabolite. It is a precorrin and a member of isobacteriochlorins. It is a conjugate acid of a precorrin-2(7-)."}]