15958-43-7 2-((2-Cyanoethyl)(4-((2-cyano-4-nitrophenyl)azo)phenyl)amino)ethylbutylcarbamate Carbamic acid, butyl-, 2-((2-cyanoethyl)(4-((2-cyano-4-nitrophenyl)azo)phenyl)amino)ethyl ester EINECS 240-091-6