AIDS-005325 AIDS005325 Cyclohexanehexamide, .delta.-[[(2-quinolinylcarbonyl)asparaginyl]amino]-.gamma.-hydroxy-.alpha.-(1-methylethyl)-N-(2,2-dimethylpropyl) U-81749E analog psi-[CHOHCH2] Asn-cHexAla Val isostere