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. 2001 Jun 12;98(13):7224–7229. doi: 10.1073/pnas.131610698

Figure 5.

Figure 5

13C NMR signals of Compound Q obtained from [6α,6,7,7α-13C4]6,7-dimethyl-8-ribityllumazine (A) from a mixture of [7α,(6α)-13C1]6,7-dimethyl-8-ribityllumazine (13C abundance: C-7α, 80%; C-6α, 20%) and [6,(7)-13C1]6,7-dimethyl-8-ribityllumazine (13C abundance: C-6, 80%; C-7, 20%) (B), and from a mixture of [6α,(7α)-13C1]6,7-dimethyl-8-ribityllumazine (13C abundance: C-6α, 80%; C-7α, 20%) and [6,(7)-13C1]6,7-dimethyl-8-ribityllumazine (13C abundance: C-6, 80%; C-7, 20%) (C). 13C coupling patterns are indicated. +, impurities.