A unique synthetic method for melatonin was established through biologically promising synthetic intermediates. 1-Hydroxymelatonin was prepared as crystals for the first time. It reacted with 85% formic acid to give (±)-3a,3a'-bispyrrolo[2,3-b]indole compound, whose structure was unequivocally determined by X-Ray crystallographic analysis
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Somei et al. (1999) studied this question.
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