4-[2-(2-Acetylamino-3-carboxy-propionylamino)-3-hydroxy-butyrylamino]-4-{1-[1-(1-{2-[N'-(2-chloro-acetyl)-N'-propyl-hydrazinocarbonyl]-pyrrolidine-1-carbonyl}-2-methyl-propylcarbamoyl)-2-methyl-propylcarbamoyl]-2-carboxy-ethylcarbamoyl}-butyric acid AIDS-121812 AIDS121812 Ac-Asp-Thr-Glu-Asp-Val-Val-Pro-AzaNVal-chloromethyl