13 C-Labelling experiments involving relatively large quantities of deaminase-cosynthetase show that the four pyrrole rings of uro'gen-III (5), and thus also of the natural porphyrins, are assembled starting from ring A with sequential addition of rings B, C, and finally ring D; ring D is that which undergoes rearrangement.
A. R. Battersby, C. J. R. Fookes, G. W. J. Matcham and E. McDonald, J. Chem. Soc., Chem. Commun., 1979, 539 DOI: 10.1039/C39790000539
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