Fragrant agarofuran and eremophilane sesquiterpenes in agarwood 'Qi-Nan' from Aquilaria sinensis

- Three new fragrant sesquiterpenes were isolated from agarwood 'Qi-Nan' from A. sinensis.
- The four isolated sesquiterpenes contribute to the elegant odor of agarwood 'Qi-Nan'.
- Eremophilane sesquiterpenes 2-4 possess acetylcholinesterase inhibitory activities.