[OH:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([N+:12]([O-])=O)=[CH:4][C:3]=1[C:15]([O:17]C1C=CC=CC=1)=O.[NH2:24][C:25]1[CH:30]=[CH:29][C:28]([S:31]([NH2:34])(=[O:33])=[O:32])=[CH:27][CH:26]=1.S(S([O-])=O)([O-])=O.[Na+].[Na+].Cl>[OH-].[Na+].COCCOCCOC>[NH2:12][C:5]1[C:6]2[C:11](=[CH:10][CH:9]=[CH:8][CH:7]=2)[C:2]([OH:1])=[C:3]([C:15](=[O:17])[NH:24][C:25]2[CH:30]=[CH:29][C:28]([S:31](=[O:33])(=[O:32])[NH2:34])=[CH:27][CH:26]=2)[CH:4]=1
A mixture composed of 30.9 g (0.1 mol) of phenyl 1-hydroxy-4-nitro-2-naphthoate, 17.2 g of p-aminobenzenesulfonamide and 200 ml of diethylene glycol dimethyl ether was heated at 160° C. for 3 hours. After cooling, the separated yellow crystals were filtered off. Yield: 19 g. 7.74 g (0.02 mol) of the resulting yellow crystals were dissolved in 100 ml of 10% sodium hydroxide. Then 40 g of sodium hydrosulfite was added at 50° to 60° C. thereto. After stirring at the same temperature for 30 minutes, the solution was allowed to cool and neutralized with diluted hydrochloric acid. The resulting light yellow precipitate of (4-a) was filtered off. Yield: 5.3 g
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