Haem A preparations from beef heart are found to be heterogeneous and demetallation yields a polar porphyrin together with porphyrin A, isolated as its crystalline dimethyl ester (2) which is studied spectroscopically and its structure confirmed by unambiguous synthesis.
M. Thompson, J. Barrett, E. McDonald, A. R. Battersby, C. J. R. Fookes, I. A. Chaudhry, P. S. Clezy and H. R. Morris, J. Chem. Soc., Chem. Commun., 1977, 278 DOI: 10.1039/C39770000278
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