[{"from": "human", "value": "Provide a brief overview of this molecule. [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-1][C][C][C][C][=Branch1][C][=O][O-1].[Mg+2]"}, {"from": "gpt", "value": "The molecule is the conjugate base of magnesium protoporphyrin, formed by deprotonation of the carboxyethyl groups at C-13 and C-17. It is the principal species at pH 7.3. It is a conjugate base of a magnesium protoporphyrin."}]