2-(N-Ethylanilino) ethanol couples with 2-amino-5-formylthiophene during the synthesis of nonlinear optical chromophores. It undergoes azo coupling with 2-cyan-4-nitroaniline to yield azochromophore AZ1Usually used in the preparation of azo compound N-ethyl-N-(2-hydroxylethyl)-4-(2-cyano-4-nitrophenylazo) aniline (AZ1). 2-(N-Ethylanilino) ethanol couples with 2-amino-5-formylthiophene during the synthesis of nonlinear optical chromophores. It undergoes azo coupling with 2-cyan-4-nitroaniline to yield azochromophore AZ1 Usually used in the preparation of azo compound N-ethyl-N-(2-hydroxylethyl)-4-(2-cyano-4-nitrophenylazo) aniline (AZ1).