118
methyl 6-oxofuranoeremophilan-15-oate (197) and 15,6α-epoxy lactone 488 [134].
However, the structure of 197 was described erroneously as “a methyl ketone,” and
the nomenclature used was also wrong. 6-Oxo compounds are rare and include ligularone (168) and its 1α-acetoxy derivative in Fig. 10.
Fig. 43 Bisabolane-type sesquiterpenoids (2)
M. Tori and C. Kuroda