A new terpenoid coumarin fromFerula kopetdaghensis

From the roots ofFerula kopetdaghensis Eug. Kor. have been isolated nevskin and isosamarcandin and a new terpenoid coumarin kopeolone, C₂₄H₃₀O₅, M⁺ 398, mp 125–126°C, α]_D ¹⁸ +70° (c 0.1, ethanol). On the basis of UV, IR, PMR, and mass spectrometry, and also of transformation into farnesiferols B and C, the configurations of kopeolone, kopeolin, kopeoside, fekrol, kopetdaghin, and fekolin have been established. The configuration of farnesiferol C suggested previously has been confirmed.