[NH2:1][C:2]1[C:7]([NH2:8])=[CH:6][CH:5]=[CH:4][C:3]=1[N+:9]([O-])=O.[C:12]1([C:18]([C:20]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)=O)=O)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.C(O)(=O)C>CO>[C:12]1([C:18]2[C:20]([C:22]3[CH:23]=[CH:24][CH:25]=[CH:26][CH:27]=3)=[N:1][C:2]3[C:3](=[CH:4][CH:5]=[CH:6][C:7]=3[NH2:8])[N:9]=2)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=11.53 g (10 mmol) of 2,3-diaminonitrobenzene and 2.00 g (9.6 mmol) of benzil were placed in four-necked flask, to which 30 g of a solvent of acetic acid and methanol at a mixing ratio of 1:1 was added for dissolution. Subsequently, the mixture was reacted at a reaction temperature of 70° C. for 2 hours. After the reaction, the solvent was removed and the resulting product was extracted with a silica gel column (ethyl acetate:hexane=1:1).
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