When cobyrinic acid is biosynthesised from uro'gen-III in deuterium oxide, deuterium is inserted at both C-18 and C-19 as shown by 13C n.m.r.; this is a further result in keeping with a biosynthetic sequence for the corrin ring of vitamin B12 involving no external redox reagents.
A. R. Battersby, C. Edington and C. J. R. Fookes, J. Chem. Soc., Chem. Commun., 1984, 527 DOI: 10.1039/C39840000527
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