Abstract:
The present invention relates to novel compounds of formula (I) which has inhibitory activities against human immunodeficiency virus ("HIV") protease, a process for the preparation thereof, and compositions for prevention or treatment of AIDS by HIV infection comprising the above compounds as active ingredients. ##STR1## wherein: R.sup.1 is an aromatic group, a nitrogen-containing aromatic group, C.sub.1-4 alkyl group optionally substituted with an aromatic group or a nitrogen-containing aromatic group, C.sub.1-4 alkoxy group optionally substituted with an aromatic group or a nitrogen-containing aromatic group; R.sup.2 is an amino acid residue or a C.sub.1-8 alkyl group substituted with a C.sub.1-4 alkylsulfonyl group; R.sup.3 is a C.sub.1-4 alkyl group optionally substituted with an aromatic group; R.sup.4 is hydrogen or a C.sub.1-2 alkyl group; R.sup.5 is a C.sub.1-10 alkyl group optionally substituted with an aromatic group; and n is 1 or 2.