A new cadinane sesquiterpene, 1β,7β(H)-3-cadinadiene-6α, 10α-diol, together with four known ones, was isolated from the ethanol extract of Acori calami (Acorus calamus L.) rhizoma. Their chemical structures were established on the basis of various spectroscopic methods and compared with data of the related known compounds. © 2015 S...