[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is heme b in which the iron has oxidation state +2. It has a role as a human metabolite and a cofactor. It is a heme b and a ferroheme. It is a conjugate acid of a ferroheme b(2-)."}, {"from": "gpt", "value": "[C][C][=C][Branch2][=Branch1][=Branch1][C][=C][C][=N][C][=Branch2][Ring2][#C][=C][C][=C][Branch2][Ring2][Branch2][C][=Branch2][Ring2][C][=C][Branch1][Ring2][N-1][Ring1][Branch1][C][=C][C][=Branch2][Ring1][Branch1][=C][Branch1][S][C][=Branch1][Ring2][=N][Ring1][Branch1][C][=C][Ring2][Ring1][Branch1][N-1][Ring2][Ring1][Ring2][C][=C][C][C][=C][C][C][=Branch1][N][=C][Ring2][Ring1][#Branch2][C][C][C][=Branch1][C][=O][O][C][C][C][C][=Branch1][C][=O][O].[Fe]"}]