2-Naphthalenesulfonic acid, 6-(acetylamino)-4-hydroxy-3-((4-methoxy-3-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-, disodium salt 6-(Acetylamino)-4-hydroxy-3-((4-methoxy-3-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-2-naphthalenesulfonic acid, disodium salt 72429-02-8