A crystalline product resulted from the reduction and acetylation of the green pigment formed from the reaction of methyl caffeate and butylamine. Its structure was determined to be that of a novel benzacridine, i.e., dimethyl-7-butyl-6, 9, 10-triacetoxybenz[k, l]- acridine-1, 2-dicarboxylate.
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Yabuta et al. (1996) studied this question.
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