The present invention encompasses compounds of formula I: ##STR1## and the pharmaceutically acceptable non-toxic salts thereof; wherein R.sub.1 is hydrogen, lower alkyl, alkenyl, alkynyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, or phenylalkyl; R.sub.2 is hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, or phenylalkyl; or NR.sub.1 R.sub.2 forms a nitrogen heterocycle; and R.sub.3 is hydrogen, an amino acid or a peptide residue. These compounds may be employed as substrates in assays for determining proteolytic enzyme activity or as enzyme inhibitors. The invention also encompasses methods for determining proteolytic enzyme activity using the compounds of formula I.
本发明涵盖了I式化合物:##STR1##及其药学上可接受的非毒性盐;其中R.sub.1是氢,低碳基,烯基,炔基,环烷基,烷基环烷基,环烷基烷基,或苯基烷基;R.sub.2是氢,烷基,烯基,炔基,环烷基,烷基环烷基,环烷基烷基,或苯基烷基;或NR.sub.1 R.sub.2形成一个氮杂环;R.sub.3是氢,
氨基酸或肽残基。这些化合物可以作为测定
蛋白酶酶活性的底物或酶
抑制剂。本发明还涵盖了使用I式化合物确定
蛋白酶酶活性的方法。