Four new sesquiterpenes including the novel sesquiterpene lactone (6R)-dehydroxysipanolinolide (1), two new eudesmane-type sesquiterpenes, curcolide (2) and curcodione (3), and a new xanthane-type sesquiterpene, curcumadionol (4), were isolated from Curcuma wenyujin Y. H. Chen et C. Ling, together