Sesquiterpene lactones of Calea zacatechichi and C. urticifolia 

 -  PhytoChemistry, 19, p.593-597, 1980 .
<br/><br/> a zacatechichi yielded the sesquiterpene lactone zexbrevin and a new analog, several analogs of neurolenin B including calein A, two analogs of budlein A and the flavones acacetin and 0-methylacacetin. C a urticifolia contained additional analogs of neurolenin B as well as a series of epoxidation products. Structures were established by spectrometric techniques. The results are contrasted with previous findings. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LEA ZACARECHICHI<br/>C. URTIFOLIA<br/>COMPOSITAE<br/>HELIANTHEAE<br/>GALINSOGINAE<br/>SESQUITERPENE LACTONES<br/>HELIANGOLIDES<br/>FLAVONES