During the biosynthesis of the macrocycle of natural porphyrins (type-III isomer), the porphobilinogen (PBG) unit forming ring D, and no other PBG unit, is found to undergo intramolecular rearrangement; 13C-n.m.r. measurements using double labelled [2,11-13C2] PBG were used.
A. R. Battersby, E. Hunt and E. McDonald, J. Chem. Soc., Chem. Commun., 1973, 442 DOI: 10.1039/C39730000442
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