An N-containing five-membered ring compound of formula (I)
wherein all symbols are the same as described in the specification, and a non-toxic salt thereof. The compound of formula (I) has an inhibitory activity against cysteine protease and therefore it is useful as an agent for the prophylaxis and/or treatment of inflammatory diseases, diseases induced by apoptosis, diseases induced by disorders of immune responses, autoimmune diseases, diseases induced by decomposition of proteins which compose organism, shock, circulatory system disorders, blood coagulation systems disorders, malignant tumors, acquired immune deficiency syndrome (AIDS) and AIDS-related complex (ARC), parasitic diseases, nerve degeneration diseases, pulmonary disorders, bone resorption diseases, endocrinesthenia, etc.
式(I)表示的含氮五元环化合物,其中所有符号与说明书中描述的相同,并且其非毒性盐。式(I)化合物具有对半胱
氨酸
蛋白酶的抑制活性,因此可用作预防和/或治疗炎症性疾病、细胞凋亡引起的疾病、免疫反应紊乱引起的疾病、自身免疫性疾病、由组成
生物体的蛋白质分解引起的疾病、休克、循环系统紊乱、血液凝固系统紊乱、恶性肿瘤、获得性免疫缺陷综合症(AIDS)和AIDS相关综合症(ARC)、寄生虫病、神经退行性疾病、肺部疾病、骨吸收疾病、内分泌疲劳等药剂。