[CH3:1][N:2]=[C:3]([OH:19])[C:4]1[C:5](=[C:9]([N+]([O-])=O)[CH:10]=[C:11]([N+:13]([O-:15])=[O:14])[CH:12]=1)[C:6]([OH:8])=[O:7].C(OCC)(=O)C.C(=O)([O-])[O-].[K+].[K+].[Cl:32][C:33]1[CH:34]=[C:35]([SH:40])[CH:36]=[CH:37][C:38]=1[Cl:39]>O1CCCC1>[CH3:1][N:2]=[C:3]([OH:19])[C:4]1[C:5](=[C:9]([S:40][C:35]2[CH:36]=[CH:37][C:38]([Cl:39])=[C:33]([Cl:32])[CH:34]=2)[CH:10]=[C:11]([N+:13]([O-:15])=[O:14])[CH:12]=1)[C:6]([OH:8])=[O:7]20.09 g (80 mmols) of 3,5-dinitrophthalic acid N-methylimide [prepared according to Example 2] are initially introduced into 300 ml of ethyl acetate and treated with 33.6 g (243 mmols) of ground, anhydrous potassium carbonate, and 15.04 g (84 mmols) of 3,4-dichlorothiophenol are then added dropwise at 25° C. After the addition of 100 ml of tetrahydrofuran, the mixture is stirred overnight and evaporated to dryness and the residue is taken up in a mixture of methylene chloride and dilute hydrochloric acid. The organic phase is washed with saturated NaCl solution, dried over sodium sulfate and evaporated. After recrystallisation from methylene chloride/n-pentane, 25.74 g (84% of theory) of the title imide, with a melting point of 167°-8° C., are obtained.
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