Four new sesquiterpenoid derivatives, ,9,13-trimethyl-4(E),8(E),12-tet
radecatrien-1-one, ,4-dihydroxyphenyl)-3,7,11-trimethyl-3-vinyl-6(E),
10-dodecadiene-1-one, 11-trimethyl-3-vingl-6(E),10-dodecadiene-1,9-dio
ne and thyl-3-vinyl-8-(4-methyl-2-furyl)-6(E)-octen-1-one were isolate
d from the roots of Ferula ferulioides. The structures of these new co
mpounds were established by; comprehensive spectral analysis. The bios
ynthetic pathway leading to these compounds is proposed based on their
structures.