| http://www.w3.org/ns/prov#value | - The present invention provides a cathepsin L inhibitor containing a compound of the formula: ##STR1## wherein R1 is a hydrogen atom or an arylalkyl, heterocyclic-alkyl or lower alkyl group which may be substituted; R2 and R3 independently are a hydrogen atom or a hydrocarbon residue which may be substituted; R4 is an alkanoyl, sulfonyl, carbonyloxy, carbamoyl or thiocarbamoyl group which may be su
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