Three racemic butanolides, majorenolide (1), majorynolide (2), and majoranolide (3), with 18 known compounds, including ten butanolides, i.e., litsenolide A(2) (4), litsenolide B(2) (5), litsenolide C(1) (6), litsenolide C(2) (7), hamabiwalactone A (8), hamabiwalactone B (9), litseakolide A (10),
Five new compounds, kotolactone A (1), kotolactone B (2), secokotomolide (3), kotodiol (4), and 2-acetyl-5-dodecylfuran (5), and 36 known compounds have been isolated from the stem wood of Cinnamomum kotoense. The structures of these new compounds were determined by means of spectroscopic analysis.