2-{3-Carboxy-2-[2-(3-methyl-2-{3-methyl-2-[methyl-(3-phenyl-propionyl)-amino]-butyrylamino}-butyrylamino)-4-oxo-4-pyrrolidin-1-yl-butyrylamino]-propionylamino}-4-methyl-pentanoic acid AIDS-188204 AIDS188204