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Tuduranine (IVa) was isolated from the root tuber of Stephania rotunda LOUREIRO and was identified. Stepharine (II) was heated with 3N sulfuric acid and tuduranine was obtained by the dienone-phenol rearrangement which proved that the absolute configuration of tuduranine is represented by the formula IVa.
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Tomita et al. (1966) studied this question.
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