Twelve rhamnofolane diterpenoids, including curcusecons A-E with unusual seco-rhamnofolane skeletons, curcusones F-J, 4-epi-curcusone E, and 3-dehydroxy-2-epi-caniojane, together with seven known analogues, curcusones A-E, jatrogrossidione, and 2-epi-jatrogrossidione, were isolated from the roots of