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Studies on the Constituents of Orchidaceous Plants. IX. Constituents of Spiranthes Sinensis (Pers.) Ames Var. Amoena (M. Bieberson) Hara. (2). Structures of Spiranthesol, Spiranthoquinone, Spiranthol-C, and Spirasineol-B, New Isopentenyldihydrophenanthrenes.