4-{N'-[1-[2-(2,4-Dinitro-phenyl)-acetyl]-3-methyl-5-oxo-1,5-dihydro-pyrazol-(4E)-ylidene]-hydrazino}-benzoic acid ethyl ester

2-{N'-[1-[2-(2,4-Dinitro-phenyl)-acetyl]-3-methyl-5-oxo-1,5-dihydro-pyrazol-(4E)-ylidene]-hydrazino}-benzoic acid

2-[2-(2,4-Dinitro-phenyl)-acetyl]-5-methyl-4-(p-tolyl-hydrazono)-2,4-dihydro-pyrazol-3-one

2-{N'-[1-[2-(2,4-Dinitro-phenyl)-acetyl]-3-methyl-5-oxo-1,5-dihydro-pyrazol-(4E)-ylidene]-hydrazino}-benzoic acid ethyl ester