Sesquiterpenes from the essential oil of Curcuma wenyujin and their inhibitory effects on nitric oxide production

Three new sesquiterpenes including a new elemane-type sesquiterpene, 5βH-elem-1,3,7,8-tetraen-8,12-olide (1), and two new carabrane-type sesquiterpenes, 7α,11-epoxy-6α-methoxy-carabrane-4,8-dione (2) and 8,11-epidioxy-8-hydroxy-4-oxo-6-carabren (3), together with eight known sesquiterpenes (4–11) were isolated from Curcuma wenyujin Y. H. Chen et C. Ling. Their structures were elucidated based on extensive spectroscopic analyses. A possible...