Abstract
Three sesquiterpenoids with unprecedented skeletons, paralemnanone (
1), isoparalemnanone (
2), and paralemnanol (
3), were isolated from the Formosan soft coral
Paralemnalia thyrsoides. Their structures were elucidated by extensive spectroscopic analysis, and the structure of
1 was further confirmed by X-ray crystallographic analysis. The absolute stereochemistries of
1–
3 were established by application of the Mosher’s method on
2.