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Two new skeleton diterpenes(galanal A and B) and a new labdane type diterpene were isolated from the seeds of Alpinia galanga WILD.(Zingiberaceae) with (E)-8, 17-epoxy-labd-12-ene-15, 16-dial and their structures were established by the spectral evidences.
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Morita et al. (1986) studied this question.
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