Studies on the Constituents of Pieris japonica. Isolation and Structural Elucidation of a New Diterpene, Asebotoxin-X and a New Diterpene Glucoside, Pieroside A

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Abstract
From P. japonica, new diterpene (asebotoxin X), a new diterpene gucoside (pieroside A) and hyperin (quercetin-3-O-galactoside) were isolated. The structures of the new natural compounds were determined by chemical and spectroscopic means and by correlation with known compounds.