AIDS-165657 AIDS165657 L-Alaninamide, N-acetyl-L-.alpha.-aspartyl-L-.alpha.-glutamyl-.beta.-phenyl-L-phenylalanyl-L-.alpha.-glutamyl-3-cyclohexyl-N1-[(1R)-1-(mercaptomethyl)-3-[methyl(2-phenylethyl)amino]-2,3-dioxopropyl]-