Compounds of the formula I: ##STR1## wherein X, Y, Z, a, b, c, R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are defined in the specification are provided. The compounds are useful as inhibitors of retroviral protease enzymes.
提供式I的化合物:##STR1##其中X、Y、Z、a、b、c、R.sub.1、R.sub.2、R.sub.3、R.sub.4和R.sub.5在说明书中有定义。这些化合物可用作逆转录病毒
蛋白酶酶的
抑制剂。