Guaianolides From Centaurea-Glastifolia

From the whole plant of Centaurea glastifolia, three new guaianolides, 19-desoxypicrolide A, 15-deschloro-15-hydroxyepisolstiolide and epicebellin J, and nine known guaianolides, cebellin J, episolstiolide, 19-desoxy-15-chlorojanerin, 15-deschloro-15-hydroperoxychlorojanerin, 17,18-desoxyrepin, centaurepensin, epicentaurepensin, repdiolide triol and aguerin B were obtained. The structures were determined by spectroscopic methods.