1,5-Naphthalenedisulfonic acid, 2-((1-hydroxy-6-(methylamino)-3-sulfo-2-naphthalenyl)azo)- 2-((1-Hydroxy-6-(methylamino)-3-sulfo-2-naphthalenyl)azo)-1,5-naphthalenedisulfonic acid 2-((1-Hydroxy-6-(methylamino)-3-sulpho-2-naphthyl)azo)naphthalene-1,5-disulphonic acid 61433-43-0 EINECS 262-786-3