Cl(O)(=O)(=O)=[O:2].[Cl:6][C:7]1[CH:12]=[CH:11][C:10]([C:13](=NC)[C:14]2[N:18]([CH3:19])[C:17]([CH2:20][C:21]([O:23]C)=[O:22])=[CH:16][C:15]=2[CH3:25])=[CH:9][CH:8]=1.S(OC)(OC)(=O)=[O:29].C(=O)(O)[O-].[Na+:39].O>C(Cl)(Cl)Cl.CO>[OH2:2].[OH2:22].[Cl:6][C:7]1[CH:12]=[CH:11][C:10]([C:13]([C:14]2[N:18]([CH3:19])[C:17]([CH2:20][C:21]([O-:23])=[O:22])=[CH:16][C:15]=2[CH3:25])=[O:29])=[CH:9][CH:8]=1.[Na+:39]
Methyl 5-[(4-chlorophenyl)(methylimino)methyl]-1,4-dimethyl-1H-pyrrole-2-acetate perchlorate (1.5 g, 3.6 mmole) was dissolved in chloroform, extracted with saturated aqueous sodium bicarbonate, dried over sodium sulfate, and concentrated. The residue was treated with dimethyl sulfate (0.5 g, 3.9 mmole) and allowed to stand at 18°-30° C. for two hours. The reaction was dissolved in methanol (10 ml) and treated with saturated aqueous sodium bicarbonate (5 ml) and water (2 ml). The solution was heated at reflux overnight, then allowed to cool to room temperature. The solid was isolated by filtration, washed with water, and air dried to yield 0.95 g (76%) of the title compound as a light tan solid, m.p. >230° C.
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