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].
The structures of two new sesquiterpene glycosides, pittosporanoside A1, and A2, isolated from the title plant were determined on the basis of chemical and spectral evidence and X-ray crystal structure analysis.
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