The present invention provides a cathepsin L inhibitor containing a compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or an arylalkyl, heterocyclic-alkyl or lower alkyl group which may be substituted; R.sup.2 and R.sup.3 independently are a hydrogen atom or a hydrocarbon residue which may be substituted; R.sup.4 is an alkanoyl, sulfonyl, carbonyloxy, carbamoyl or thiocarbamoyl group which may be substituted; X is formula: --CHO or --CH.sub.2 OB (wherein B is a hydrogen atom or a protecting group of hydroxyl group); m and n independently are an integer of 0 or 1; provided that R.sup.4 is an alkanoyl group substituted by aryl, a sulfonyl group substituted by aryl having more than 9 carbon atoms or by lower alkyl, or a carbamoyl or thiocarbamoyl group which may be substituted when R.sup.1 is an unsubstituted lower alkyl, arylalkyl on methylthioethyl group, R.sup.2 and R.sup.3 independently are a lower alkyl or arylalkyl, X is --CHO, m is 1 and n is 0 or 1, or a salt thereof.
本发明提供了一种含有公式化合物的cathepsin L
抑制剂:##STR1## 其中R.sup.1是氢原子或可被取代的芳基烷基,杂环烷基或较低的烷基基团; R.sup.2和R.sup.3独立地是氢原子或可被取代的碳氢残基; R.sup.4是可被取代的烷酰基,磺酰基,羰氧基,
氨基甲酰基或
硫氨基甲酰基基团; X是公式:--CHO或--CH.sub.2 OB(其中B是氢原子或羟基的保护基团); m和n独立地是0或1的整数; 前提是当R.sup.1是未取代的较低的烷基,芳基烷基或甲基
硫乙基时,R.sup.4是被芳基取代的烷酰基,被具有9个以上碳原子的芳基或较低的烷基取代的磺酰基,或可被取代的
氨基甲酰基或
硫氨基甲酰基时,R.sup.2和R.sup.3独立地是较低的烷基或芳基烷基,X是--CHO,m为1且n为0或1,或其盐。