| sesquiterpene lactones from the endemic cape verdean artemisia gorgonum. | leaves and flowers of artemisia gorgonum (asteraceae) collected in fogo, cape verde islands, were phytochemically investigated and resulted in isolation and characterization of three guaianolides 1, 2, 5, and a secoguainolide 4, in addition to eight known guaianolides 6-11 and two known germacranolides 12, 13. structures were elucidated by 1d and 2d nmr experiments. careful examination of the (13)c nmr spectrum led to revision of the structure of a previously described guaianolide from 2 to 3. m ... | 2008 | 19007951 |