93951-21-4 EINECS 300-644-5 Tetrasodium 4-amino-5-hydroxy-6-((2-methoxy-5-((2-(sulphonatooxy)ethyl)sulphonyl)phenyl)azo)-3-((4-((2-(sulphonatooxy)ethyl)sulphonyl)phenyl)azo)naphthalene-2,7-disulphonate