2-Naphthalenecarboxylic acid, 4-((2,5-dichlorophenyl)azo)-3-hydroxy- 4-((2,5-Dichlorophenyl)azo)-3-hydroxy-2-naphthalenecarboxylic acid 4-((2,5-Dichlorophenyl)azo)-3-hydroxy-2-naphthoic acid 51867-77-7 EINECS 257-484-3