66214-47-9

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