HETEROCYCLES

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact: purchase@heterocycles.com

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

■ 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.

Abstract

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.