2-[3-Carboxy-2-(2-{2-[3,3-dimethyl-2-(3-phenyl-propionylamino)-butyrylamino]-3-methyl-butyrylamino}-4-oxo-4-pyrrolidin-1-yl-butyrylamino)-propionylamino]-4-methyl-pentanoic acid AIDS-188193 AIDS188193