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Report | Regular issue | Vol 23, No. 10, 1985, pp.2543-2548
Published online, 1st January, 1970
DOI: 10.3987/R-1985-10-2543
Xanthones from Hypericum sampsonii

Ming-Tyan Chen and Chiu-Ming Chen*

*Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan 30013, Taiwan, R.O.C.


Hypericum sampsonii Hance contains mangiferin, isomangiferin, 2-hydroxy-3,4-dimethoxyxanthone, toxyloxanthone B, and a new compound, hyperxanthone, which was identified as 5,9-dihydroxy-3,3-dimethylpyrano[3,2-a]xanthen-12(3H)-one on the basis of spectroscopic evidences. Characteristic fragment ions in the mass spectrum of pyranoxanthone are discussed.