[CH3:1][C:2]1[C:6]([CH3:7])=[CH:5][NH:4][N:3]=1.[CH2:8]=[O:9]>CO>[OH:9][CH2:8][N:4]1[CH:5]=[C:6]([CH3:7])[C:2]([CH3:1])=[N:3]196 g (1.0 mol) of 3,4-dimethylpyrazole in 50 ml of methanol were dissolved in 100 g (1.0 mol) of formalin solution (30%) at room temperature. Water and methanol were then evaporated. The title compound remained as a white solid (yield 95%).
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