115703-19-0 1H-Pyrazole-4-carboxylic acid, 1-methyl-3-((((4-nitrophenyl)methylene)hydrazino)sulfonyl)-, ethyl ester Ethyl 1-methyl-3-((((4-nitrophenyl)methylene)hydrazino)sulfonyl)-1H-pyrazole-4-carboxylate