A new compound named eucamalol and 4-isopropylbenzyl alcohol were isol
ated as mosquito repellents from the essential oil of Eucalyptus camal
dulensis. The structure of eucamalol was elucidated to be 3-formyl-6al
pha-isopropyl-2-cyclohexen-1beta-ol by H-1 NMR analysis and confirmed
by synthesis. Both compounds exhibited potent repellent activities aga
inst Aedes aegypti.