The structure of a new isocoumarin derivative, achlisocoumarin IV [1],
isolated from the underground parts of Achlys triphylla was character
ized by means of its spectroscopic properties. The chemical constituen
ts of Ac. triphylla and Ac. triphylla subsp. japonica were compared by
hplc to find their chemotaxonomic similarities and differences. Resul
ts showed a chemotaxonomically close relationship.