Sesquiterpenes from the rhizomes of Acorus calamus var. angustatus Besser and their neuroprotective properties.
Five sesquiterpenes were isolated from the dried rhizomes of Acorus calamus var. angustatus Besser. Their structures were determined by spectroscopic analysis and ECD calculations, including one new eudesmane-type sesquiterpene, 2-hydroxy-eudesmane K (1), and four known compounds: eudesmane K (2), isocalamendiol (3), a...