From the leaves of Machilus japonica Sieb. et Zucc., four lignans were isolated; they have been found to be (+)-galbacin [1], (+)-galbelgin [2], (−)-licarin-B [4], and a new lignan, machilusin, whose structure can be described as [3a] or [3b].
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Takaoka et al. (1976) studied this question.
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