SMILES: CC1=C(C2=CC3=NC(=CC4=C(C(=C([N-]4)C=C5C(=C(C(=N5)C=C1[N-]2)C=C)C)C=C)C)C(=C3CCC(=O)[O-])C)CCC(=O)[O-].[Mg+2]
Description: 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.