The 7-methyl protons of 6,7-dimethyl-8-D-ribityl-lumazine and some analogues exchange with deuterium, and the deuteriated 8-hydroxyethyl-6,7-dimethyl-lumazine has been converted into a deuteriated flavin in a reaction which simulates the biosynthesis of riboflavin.
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PATERSON et al. (1969) studied this question.