PROBLEM TO BE SOLVED: To provide a tea catechin derivative that has a stronger action.SOLUTION: A 8-dimethylallyl-(-)-epigallocatechin-3-O-gallate as the tea catechin derivative is shown by the chemical formula, and an angiotensin I-converting enzyme inhibitor includes the tea catechin derivative.COPYRIGHT: (C)2013,JPO&INPIT【課題】より強力な作用を有する茶カテキン誘導体の提供。【解決手段】茶カテキン誘導体として、下記式で表される8-ジメチルアリル-(-)-エピガロカテキン-3-O-ガレートをアンジオテンシンI変換酵素阻害剤。【選択図】なし