1,1-dimethylethyl (2S,4R)-4-{[(2,5-dibromo-3,6-difluorophenyl)sulfonyl]amino}-2-methyl-1-pyrrolidinecarboxylate 、 1,1-dimethylethyl (2R,4R)-4-{[(2,5-dibromophenyl)sulfonyl]amino}-2-({[(phenylamino)carbonyl]amino}methyl)-1-pyrrolidinecarboxylate 以to afford the title compound (˜73 mg)的产率得到2,5-dibromo-N-[(3R,5R)-1-cyano-5-({[(phenylamino)carbonyl]amino}methyl)-3-pyrrolidinyl]benzenesulfonamide