Labdane and Bisnorlabdane Type Diterpenes from Alpinia speciosa K. SCHUM.
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Two new diterpenes were isolated from the rhizomes of Alpinia speciosa K. SCHUM. (Zingiberaceae) and their structures were established by the spectral evidences as I and II. The latter has an unusual bisnorlabdane carbon skeleton. It is the first example that diterpenes were obtained from Alpinia genus.