1,4-Benzenedicarboxylic acid, 2,2'-(1,4-phenylenebis(imino(1-acetyl-2-oxo-2,1-ethanediyl)azo))bis-, tetramethyl ester 68516-73-4 77465-46-4 EINECS 271-176-6 N,N'-p-Phenylenebis(2-(2,5-dicarbomethoxyphenyl)azo)acetoacetamide Tetramethyl 2,2'-(1,4-phenylenebis(imino(1-acetyl-2-oxoethane-1,2-diyl)azo))bisterephthalate