The structures of carbazomycins A and B are elucidated to be 3,4-dimethoxy-1,2-dimethylcarbazole and 4-hydroxy-3-methoxy-1,2-dimethylcarbazole, respectively. Further, 13C-chemical shifts of carbazomycins and their derivatives are assigned simultaneously.
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Sakano et al. (1980) studied this question.
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