C([NH:4][C:5]1[CH:6]=[C:7]([CH:11]=[CH:12][C:13]=1[N+:14]([O-:16])=[O:15])[C:8]([OH:10])=O)(=O)C.[C:17]1([S:23]([NH2:26])(=[O:25])=[O:24])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.C1(C2CCCCCCCCCC=2)CCCCCCCCNN=1>CN(C)C=O>[C:17]1([S:23]([NH:26][C:8](=[O:10])[C:7]2[CH:11]=[CH:12][C:13]([N+:14]([O-:16])=[O:15])=[C:5]([NH2:4])[CH:6]=2)(=[O:25])=[O:24])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1N,N′-carbonyldiimidazole (28.9 g) is added to an N,N-dimethylformamide (300 ml) solution of 3-acetylamino-4-nitro-benzoic acid (20.0 g), and the solution is stirred for 1 hour at room temperature. Further, benzenesulfonamide (28.0 g) and diazabicycloundecene (27.16 g) are added to the solution and the solution is stirred for 4 days at 100° C. The solvent is removed through evaporation under reduced pressure. Chloroform and 10% sodium hydroxide aqueous solution are added to the residue, and the mixture is stirred briskly. 10% hydrochloric acid is added to the aqueous layer until neutral. Chloroform is added and the solution is stirred briskly. The precipitated crystals are separated through filtration, and are dried. Thus, N-benzenesulfonyl-3-amino-4-nitrobenzamide (14.4 g) is obtained.
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