[I-].[CH3:2][N+:3]1[CH2:12][CH2:11][C:10]2[C:5](=[CH:6][C:7]([O:15][CH3:16])=[C:8]([O:13][CH3:14])[CH:9]=2)[CH:4]=1.[CH2:17]([O:19][C:20]1[C:29]([O:30][CH2:31][CH3:32])=[C:28]([O:33][CH2:34][CH3:35])[C:27]([N+:36]([O-:38])=[O:37])=[C:26]2[C:21]=1[CH2:22][O:23][C:24]2=[O:25])[CH3:18].C(=O)([O-])[O-].[K+].[K+].CO>O>[CH3:2][N:3]1[CH2:12][CH2:11][C:10]2[C:5](=[CH:6][C:7]([O:15][CH3:16])=[C:8]([O:13][CH3:14])[CH:9]=2)[CH:4]1[CH:22]1[C:21]2[C:26](=[C:27]([N+:36]([O-:38])=[O:37])[C:28]([O:33][CH2:34][CH3:35])=[C:29]([O:30][CH2:31][CH3:32])[C:20]=2[O:19][CH2:17][CH3:18])[C:24](=[O:25])[O:23]1200 g (0.6 mole) of 2-methyl-6,7-dimethoxy-3,4-dihydro-isoquinolinium iodide (prepared in the same manner as the compound of Example A) 186 g of 4,5,6-triethoxy-7-nitrophthalide and 100 g of potassium carbonate are added to 1.5 l of methanol while stirring. The reaction mixture is stirred for 24 hours at a temperature below the boiling point of the solvent, and is then allowed to cool; 900 ml of water is added and the reaction solution is allowed to crystallise. The solution is filtered, rinsed with methanol, and then with water.
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