2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-((1-sulfo-2-naphthalenyl)azo)- 5-Amino-4-hydroxy-3-((1-sulfo-2-naphthalenyl)azo)-2,7-naphthalenedisulfonic acid 5-Amino-4-hydroxy-3-((1-sulpho-2-naphthyl)azo)naphthalene-2,7-disulphonic acid 65237-05-0 EINECS 265-652-2