An enzyme system from the vitamin B12 producer Propionibacterium shermanii converts uro'gen-III(2) into 15,23-dihydrosirohydrochlorin (7), the structure being established by 1H and 13C n.m.r. spectroscopy; this dihydro-macrocycle is enzymically converted into cobyrinic acid (6).
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Battersby et al. (1982) studied this question.