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The structure of the higher homologues (C34–C36) of porphyrin acids of the Messel oil shale, elucidated by nuclear Overhauser effect studies in the case of the C35 compound, reflect their origin from photosynthetic bacteria.
R. Ocampo, H. J. Callot and P. Albrecht, J. Chem. Soc., Chem. Commun., 1985, 200 DOI: 10.1039/C39850000200
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