2-{2-(2-Hydrazinocarbonyl-pyrrolidin-1-yl)-2-oxo-1-[1-(toluene-4-sulfonyl)-1H-imidazol-4-ylmethyl]-ethylcarbamoyl}-5-oxo-pyrrolidine-1-carboxylic acid benzyl ester AIDS-057567 AIDS057567 NSC668460