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Regiochemistry of 6,7-dimethyl-8-ribityllumazine conversion into Compound Q. (A) Isotopomer mixture of Compound Q obtained from [7α,(6α)-13C1]- and [6,(7)-13C1]6,7-dimethyl-8-ribityllumazine. (B) Isotopomer mixture of Compound Q obtained from [6α,(7α)-13C1]- and [6,(7)-13C1]6,7-dimethyl-8-ribityllumazine. 13C enrichments ≈80% 13C (●) or 20% 13C (○) are indicated. R, ribityl.
