2-Imidazolyl HOEt isostere AIDS-006587 AIDS006587 [2-Hydroxy-5-phenyl-1-(phenylmethyl)-4-[4-(2-methylbutyryl)-1H-imidazol-2-yl)pentyl]carbamic acid, 1,1-dimethylethyl ester [1S-(1R*,2R*,4S*)]