STUDIES ON THE CHEMICAL CONSTITUENTS OF AQUILARIA SINENSIS (LOUR.) GILG. Ⅱ. ISOLATION AND STRUCTURE OF BAIMUXINOL AND DEHYDROBAIMUXINOL

Two new sesquiterpenoids, baimuxinol C₁₅)H₂₆O₂ mp 128～130℃,. α_D³⁰-83°(c 0.56, CHCl₃) and dehydrobaimuxinol C₁₅H₂₄O₂ mp 136～138℃,α_D²⁶+25°(c, 1.60, CHCl₃), have been isolated from the volatile oil of Aquilaria sinensis (Lour). Gilg. (Thymelaceae) by silica gel column chromatog raphy. Based on spectral (IR,¹H NMR and MS)analysis and chemical reactions their structures were idenntified as(Ⅰ)and (Ⅱ) respectively.