A porphyrin heptacarboxylic acid, probably identical with phyriaporphyrin-III, is isolated and evidence from 13C-n.m.r. and synthetic studies shows that it has structure (10); general synthetic methods are outlined.
A. R. Battersby, E. Hunt, M. Ihara, E. McDonald, J. B. Paine, F. Satoh and J. Saunders, J. Chem. Soc., Chem. Commun., 1974, 994 DOI: 10.1039/C39740000994
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