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Updated: Aug 25, 2026

Plant Growth and Agrobacterium-mediated Floral-dip Transformation of the Extremophyte Schrenkiella parvula
Published on: January 7, 2019
[Daviditin B from Swertia davidi Franch]
Gui-shan Tan1, Kang-ping Xu, Fu-shuang Li
1School of Pharmaceutical Sciences, Central South University, Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, China. tgs395@yahoo.com.cn
Aim:
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).
Conclusion:
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.
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