4-[2-(2-Acetylamino-3-carboxy-propionylamino)-3-hydroxy-butyrylamino]-4-[2-carboxy-1-(1-{1-[2-(N'-ethoxyoxalyl-N'-propyl-hydrazinocarbonyl)-pyrrolidine-1-carbonyl]-2-methyl-propylcarbamoyl}-2-methyl-propylcarbamoyl)-ethylcarbamoyl]-butyric acid AIDS-121815 AIDS121815