Chemical constituents of the wood of root of Xanthoxylum inerme KOIDZ. (Fagara boninensis KOIDZ.), (Japanese name "Akou-zansho"), were examined. Two new monomeric phenylpropanoids, methyl boninenalate (16), mp 107-180°, and boninenal (19), mp 95-97.5°, were isolated together with nine known chemical components [Alkaloids : nitidine (1), oxynitidine (6), dictamnine (12). Coumarins : aesculetin dimethyl ether (7), 6, 7, 8-trimethoxycoumarin (9). Amides : N-benzoyltyramine methyl ether (18), (±)-tembamide (21). Lignan : (±)-syringaresinol (10). Others : β-sitosterol (11)].
