Xanthones from Chironia krebsii

From a dichloromethane extract of the aerial parts and from a methanolic root extract of Chironia krebsii, 11 1-hydroxyxanthones and six xanthone glycosides have been isolated. The glycosides 5-hydroxy-3-methoxy-1- O-primeverosylxanthone, 1-hydroxy-3-methoxy-5- O-primeverosylxanthone, 5-hydroxy-3-methoxy-1- O-β- d-glucosyl-xanthone, 3,5,6,7,8-pentamethoxy-1- O-primeverosylxanthone are new natural products. Their structures were established by spectroscopic (UV, EIMS, D/CIMS, 1H and 13C NMR) and chemical methods.