1(2H)-Pyrimidineacetamide, N-[(1S,3S,4S)-4-[[2-(4-fluoro-2,6-dimethylphenoxy)acetyl]amino]-3-hydroxy-5-phenyl-1-(phenylmethyl)pentyl]tetrahydro-.alpha.-(1-methylethyl)-2-oxo-, (a1S)- AIDS-121170 AIDS121170