label: but-2-enedioic acid mono-(2-((4-(4-(2-carboxy-2-cyano-vinyl)-phenylazo)-phenyl)-methyl-amino)-ethyl) ester
label_lc: but-2-enedioic acid mono-(2-((4-(4-(2-carboxy-2-cyano-vinyl)-phenylazo)-phenyl)-methyl-amino)-ethyl) ester