Alkaloid and sesquiterpenes from the root tuber of Curcuma longa

One new quinoline alkaloid and seven known bisabolane sesquiterpenes: 2-(2′-methyl-1′-propenyl)-4,6-dimethyl-7-hydroxyquinoline (1), 2,5-dihydroxybisabola-3,10-diene (2), 4,5-dihydroxybisabola-2,10-diene (3), turmeronol A (4), bisacurone (5), bisacurone A (6), bisacurone B (7), bisacurone C (8), as well as dehydrozingerone (9) and zingerone (10) were isolated from the root tuber of Curcuma longa. Their structures were identified by spectral evidence. Compound 1 is a new compound, compounds 6-8 were isolated from this plant for the first time and compounds 9-10 from Curcuma for the first time.