4-[[[3-[2-[[(2,2-Dimethylethyl)amino]carbonyl]-1-pyrrolidinyl]-2-hydroxypropyl]amino]carbonyl]-5,5-dimethyl-.alpha.-[(phenylacetyl)amino]-N-(phenylmethyl)-2-thiazolidineacetamide, [2R-[2.alpha.(R*) AIDS-072177 AIDS072177