1961 年 81 巻 1 号 p. 129-138
Xi-xin is a crude drug using a subterranean portion of a few plants of Asiasarum genus (Asaraceae family). The most important of its component has been reported as methyleugenol which makes up about 50% of its essential oil but this was found to vary greatly according to habitat of the plant. Some plants contained safrole, eucarvone, and 1, 8-cineol as the chief components. Xi-xin oil from Manchurian plant was proved to contain elemicin, an isomer of cis-asaron.
Tu-xi-xin is the dried root of Hetehotropa genus of the same family and used as a substitute for Xi-xin. The chief component of its essential oil had been reported as safrole but elemicin was found to be present as the chief component in some of the crude drug.