Planta Medica 2012-Sep
New xanthone glycosides from Comastoma pedunculatum.
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Five new xanthone glycosides, comastomasides A-E (1-5), were isolated from aqueous ethanol extracts of the aerial portions of Comastoma pedunculatum. The structures of these compounds were elucidated by spectroscopic analysis methods. Compounds 1-5 were evaluated for their hepatoprotective activity and cytotoxicity against four human cancer cell lines by in vitro assays. Among them, compounds 3 and 5 exhibited potent hepatoprotective activity. However, none of the compounds displayed cytotoxic activity.