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Four novel prenyl-furocoumarin type sesquiterpenoid derivatives, 2,3-dihydro-7-hydroxy-2S*,3R*-dimethyl-3-[4,8-dimethyl-3(E),7-nonadie nyl]-furo[3,2-c]coumarin, 2,3-dihydro-7-hydroxy-2R*,3R*-dimethyl-3-[4,8-dimethyl-3(E),7-nonadie nyl]-furo[3,2-c]coumarin, 2,3-dihydro-7-hydroxy-2S*,3R*-dimethyl-3-[4-methyl-5-(4-methyl-2-furyl)- 3(E)-pentenyl]-furo[3,2-c]coumarin, and 2,3-dihydro-7-methoxy-2S*,3R*-dimethyl-3-[4,8-dimethyl-3(E),7-nonadie nyl]-furo]3,2-c]coumarin were isolated from the roots of Ferula ferulaeoides [corrected]. Their structures were established by detailed spectral analysis and the biosynthetic pathway leading to these prenyl-furocoumarin type sesquiterpenoids is proposed based on these structures.

Sesquiterpenoid Derivatives from Ferula ferulioides. IV.