| Popis: |
The aerial parts of Bejaranoa balansae afforded in addition to known sesquiterpene lactones six new ones, two highly oxygenated germacranolides and four guaianolides including balansolide with a 2,9-ether bridge. Furthermore, two geranyl nerol derivatives were present. The configuration of some 10,14-epoxyguaianolides have been revised from 10β to 10α and the stereochemistry at C-4 in 4,5-dihydrofuroheliangolides has also been corrected to 4β-methyl. The structures were elucidated by NMR spectroscopy. |
