Also Called: tetrasodium;(3E)-3-[[4-[4-[[2,6-diamino-3-methyl-5-[[(7Z)-8-oxo-3,6-disulfonato-7-[(4-sulfonatonaphthalen-1-yl)hydrazinylidene]naphthalen-2-yl]diazenyl]phenyl]diazenyl]phenyl]phenyl]hydrazinylidene]-6-oxocyclohexa-1,4-diene-1-carboxylate