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Two new phthalide dimers from the rhizomes of Ligusticum chuanxiong
Wei Wei1, Wei Xu1, Xiu-Wei Yang1
1a State Key Laboratory of Natural and Biomimetic Drugs, Department of Natural Medicines, School of Pharmaceutical Sciences, Peking University Health Science Center , Peking University , Beijing 100191 , China.
Abstract:
Two pairs of diastereoisomers, namely (3'Z)-(3S,8S,3a'S,6'R)-4,5-dehydro-3.3a',8.6'-diligustilide (1) and (3'Z)-(3S,8R,3a'S,6'R)-4,5-dehydro-3.3a',8.6'-diligustilide (3), chuanxiongdiolide R3 (2), and chuanxiongdiolide R1 (4), were isolated from the 95% ethanolic aqueous extract of the rhizomes of Ligusticum chuanxiong. Among these Phthalide dimers, compounds 1 and 2 were new ones. The structures of the new isolates were elucidated based on spectroscopic data analyses, and their absolute configurations were determined by comparison of experimental and calculated electronic circular dichroism spectra.
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