3-methyl-2H-pyrazolo[3,4-b]quinoline

4-[(2-aminophenyl)methylidene]-3-methyl-1H-pyrazol-5-one

3-methyl-4-[(4-nitrophenyl)diazenyl]-1,4-dihydropyrazol-5-one

5-methyl-4-nitro-1,2-dihydropyrazol-3-one

2,4-diacetyl-5-methyl-4H-pyrazol-3-one