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Isodaphnoretin B,a New Bicoumarin from Stellera chamaejasme

YANG Guo-Hong,CHEN Dao-Feng * Department of Pharmacognosy,Fudan University,Shanghai 200032,P.R.China  
AIM:To study the chemical constituents of the root of Stellera chamaejasme.METHODS:Silica gel column chromatogramphy was used to isolate the compounds,and spectroscopic techniques(NMR,UV,IR,MS and optical rotations)were used for the structural elucidation.RESULTS:Two bicoumarins:7-hydroxy-5,6-dimethoxy-3-[(2-oxo-2H-1-benzopyran-7-yl)oxy]-2H-1-benzopyran-2-one,named isodaphnoretin B(1)and daphnoretin(2)were obtained from the root of Stellera chamaejasme.CONCLUSION:Compound 1 is a new bicoumarin.
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