An epoxysuccinic acid derivative represented by the formula ##STR1## wherein R.sup.1 is a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms, and a pharmaceutically acceptable salt are useful as cathepsin B inhibitors.
一种表达式为##STR1##的环氧
琥珀酸衍
生物,其中R.sup.1是氢原子或含有1至4个碳原子的烷基,以及其药学上可接受的盐,可用作猫hepsin B
抑制剂。