128153-91-3 2-(2-Chloro-6-nitrobenzylidene)carbazic acid ethyl ester BRN 3558017 Carbazic acid, 2-(2-chloro-6-nitrobenzylidene)-, ethyl ester Hydrazinecarboxylic acid, 2-((2-chloro-6-nitrophenyl)methylene)-, ethyl ester