2,7-Naphthalenedisulfonic acid, 5-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-4-hydroxy-3-((4'-((2-hydroxy-3,6-disulfo-1-naphthalenyl)azo)-3,3'-dimethoxy(1,1'-biphenyl)-4-yl)azo)-, tetrasodium salt 66214-47-9 68084-10-6 EINECS 266-246-8