[Daviditin B from Swertia davidi Franch].
OBJECTIVE
To study the active constituents of Swertia davidi Franch.


METHODS
Chemical components were isolated by column chromatography and their structures were established mainly by spectroscopic means (UV, IR, NMR, 2D-NMR, MS).


RESULTS
Three substances were identified as 2,5-dimethoxyl-1, 4-dicarboxyl benzene (VIII), 1,5,8-trihydroxyl-3,4-dimethoxyl xanthone (IX) and 1,8-dihydroxyl-3-(3'-hydroxyl-butoxy) xanthone (X).


CONCLUSIONS
Compounds VIII and IX were isolated from Swertia davidi Franch, for the first time, whereas compound X is a new xanthone, named daviditin B with antioxygenated activity in vitro.
Tan
Gui-shan
GS
School of Pharmaceutical Sciences, Central South University, Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, China. tgs395@yahoo.com.cn
Xu
Kang-ping
KP
Li
Fu-shuang
FS
Xu
Ping-sheng
PS
Hu
Gao-yun
GY
Jiang
De-jian
DJ
Li
Yuan-jian
YJ
D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D029967:Swertia / Q000737:chemistry*; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification*
C489701:1,8-dihydroxyl-3-(3'-hydroxyl-butoxy) xanthone; D000975:Antioxidants; D044004:Xanthones