[CH2:1]([NH2:4])[CH2:2][NH2:3].Cl[CH2:6][C:7]1[N:8]=[N:9][CH:10]=[CH:11][CH:12]=1>>[N:9]1[CH:10]=[CH:11][CH:12]=[C:7]([CH2:6][NH:3][CH2:2][CH2:1][NH2:4])[N:8]=1Reacting ethylenediamine with 3-chloromethylpyridazine by the procedure of Example 34 gives N-(3-pyridazinylmethyl)ethylenediamine. This intermediate is reacted with S-methylisothiouronium sulphate by the procedure of Example 1 to give the title compound.
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