Abstract From a hexane extract of the aerial parts ofAchillea odorata, two nerolidol derivatives,(6E)-5, 9-diacetoxynerolidol and (6E)-9-acetoxy-5-hydroxynerolidol, six bisabolene derivatives, 7, 10-dihydroxy-bisabol-2, 11-diene, 7, 11-dihydroxy-bisabol-2, 9E-