A bisabolane sesquiterpene, rel-(1S,4R,5S,6R)-4,5-diacetoxy-6- [(R)-5-hydroxy-1,5-dimethylhex-3-enyl]- 3-methylcyclohex-2-enyl (Z)-2-methylbut-2 -enoate, which was newly isolated from the roots of Leontopodium longifolium, presented specific anticancer activity against human leukemia HL-60 cells,
From the roots of Leontopotium longifolium, three new bisabolane sesquiterpenes, rel-(1S,4R,5S,6R)-4,5-diacetoxy-6-[(R)-1,5-dimethylhexa-3,5-dienyl]-3-methylcyclohex-2-enyl (Z)-2-methylbut-2-enoate (1), rel-(1S,4R,5S,6R)-4,5-diacetoxy-6-[(R)-5-hydroxy-1,5-dimethylhex-3-enyl]-3-methylcyclohex-2-enyl