[NH2:1][CH2:2][C:3]([NH2:6])([CH3:5])[CH3:4].[N:7]#[C:8][Br:9]>>[BrH:9].[CH3:4][C:3]1([CH3:5])[CH2:2][NH:1][C:8](=[NH:7])[NH:6]1The process is carried out according to the procedure described in stage f of Example 1, using 21 g of 1,2-diamino-2-methylpropane and 25.3 g of cyanogen bromide. 46 g of 4,4-dimethylimidazolidin-2-ylideneamine hydrobromide are thus obtained, in the form of a white solid, the characteristics of which are the following:
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