145865-75-4 1H-Pyrazole-4-carboxylic acid, 3-((((4-chlorophenyl)methylene)hydrazino)sulfonyl)-1-methyl-, ethyl ester Ethyl 3-((((4-chlorophenyl)methylene)hydrazino)sulfonyl)-1-methyl-1H-pyrazole-4-carboxylate