In order to clarify the stereochemistry of linderalactone (I) and linderane (XXI), components of the root of Lindera strychnifolia Vill., the absolute configuration of isolinderalactone (II), a Cope rearrangement product of (I), was elucidated. From this result and from n.m.r. spectral data, the absolute configurations of (I) and (XXI) were also clarified.