4-[(4-chloro-5-methyl-2-sulphophenyl)azo]-3-hydroxy-2-naphthoic acid

2-(2-Hydroxy-3-carboxy-1-naphtylazo)-4-methyl-5-chlorobenzenesulfonic acid

4-(4-Chloro-5-methyl-2-sulfophenylazo)-3-hydroxy-2-naphthalenecarboxylic acid