[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C@@][C][C][=Branch1][C][=O][O][C@@][Ring1][=Branch1][C@@][Branch2][Branch2][=C][C][=C][Branch2][Branch2][Ring1][C][=Branch2][#Branch1][Branch2][=C][Branch1][Ring2][N][Ring1][Branch1][C][C][=C][Branch2][=Branch1][Branch1][C][=Branch2][Branch1][O][=C][Branch1][Ring2][N][Ring1][Branch1][/C][=C][/C@H1][Branch2][Ring2][Branch2][C@][Branch2][Ring1][O][/C][=Branch2][Ring1][Ring2][=C][/C][=Branch1][Branch1][=N][Ring2][Ring1][Branch1][C@H1][Ring2][Ring1][O][C][C][C][=Branch1][C][=O][O][/N][\\-Ring1][=C][Branch1][C][C][C][C][=Branch1][C][=O][O][C][C][C][=Branch1][C][=O][O][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][Branch1][C][C][O]"}, {"from": "gpt", "value": "The molecule is the intermediate in the biosynthesis of vitamin B12 from uroporphyrinogen III in which three methyl groups have been introduced at positions 2, 7 and 20 of the tetrapyrrole framework and in which the carboxymethyl group at position 2 has been oxidised to form a lactone ring. It is a conjugate acid of a precorrin-3B(7-) and a precorrin-3B(6-)."}]