C(O)(=O)/C=C\C(O)=O.[CH3:9][N:10]([CH2:12][C:13]1[O:17][C:16]([CH2:18][S:19][C:20](=N)N)=[CH:15][CH:14]=1)[CH3:11].ClC[CH2:25][NH:26][C:27]([NH:32][CH3:33])=[CH:28][N+:29]([O-:31])=[O:30].C(=O)([O-])[O-].[K+].[K+]>O.O1CCCC1>[CH3:11][N:10]([CH2:12][C:13]1[O:17][C:16]([CH2:18][S:19][CH2:20][CH2:25][NH:26][C:27]([NH:32][CH3:33])=[CH:28][N+:29]([O-:31])=[O:30])=[CH:15][CH:14]=1)[CH3:9]A mixture of 1-[[[5-[(dimethylamino)methyl]-2-furanyl]-methyl]thio]methanimidamide maleate (1:2) (2.23 g), N-(2-chloroethyl)-N'-methyl-2-nitro-1,1-ethenediamine (0.9 g) and potassium carbonate (3.46 g) in water (10 ml) and tetrahydrofuran (10 ml) was stirred under nitrogen at room temperature for 5 days. The suspension was evaporated in vacuo; the residue suspended in water (50 ml) and extracted with ether (2×40 ml). The aqueous fraction was evaporated in vacuo and magnesium sulphate and tetrahhydrofuran (100 ml) added. After 18 hours, the mixture was filtered and the filtrate evaporated to give a semi-solid which was chromatographed (silica/methanol). The appropriate eluate was evaporated in vacuo to give the title compound (0.3 g), which had an n.m.r. identical to that of the product according to Example 1 above.
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