1,3-Benzenedicarboxylic acid, 5-((3-(carboxymethyl)-4-hydroxyphenyl)azo)-, 1,3-dimethyl ester 2-Hydroxy-5-((3,5-bis(methoxycarbonyl)phenyl)azo)benzeneacetic acid 3,5-Dicarbomethoxy-3'-carboxymethyl-4'-hydroxyazobenzene 99435-38-8 Ph CL 28A Ph CL28A Ph-CL-28-A