4-piperidinoazo-benzoic acid
1-(4-carboxyphenyl)-6-methyl-4-oxo-1,4-dihydropyridazine-3-carboxylic acid
4-(4'-hydroxy-naphthalen-1-ylazo)benzoic acid
4-(4,5-dimethyl-2-D-ribitol-1-yl-phenylazo)-benzoic acid
4-(3-isobutyl-N'''-phenyl-formazano)-benzoic acid