Sesquiterpene lactones, a labdane and other constituents of Urolepis hecatantha and chromolaena arnottiana

Abstract

Aerial parts of Urolepis hecatantha afforded several heliangolides, a new labdane, the oleate of 9-hydroxy-Z, E-farnesol, a new toxol and isopentenylacetophenone derivatives as well as a number of common plant constituents. Aerial parts of Chromolaena arnottiana contained 5,3′-dihydroxy-6,7,4′-trimethoxyflavone, 5-hydroxy-6,7,3′,4′-teramethoxyflavone, 5-hydroxy, 6,7,3′,4′,5′-pentamethoxyflavone, other common plant constituents and a derivative of 3,4-dihydroxyacetophenone.