acid orange 63 (C.I. 22870)

[1,1’-biphenyl]-3-sulfonicacid,4’-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulfophen

disodium 4-(4-((4-methylphenyl)sulphonyloxy)phenylazo)-4-(5-hydroxy-3-methyl-1-(4-sulphonatophenyl)-1H-pyrazol-4-ylazo)-1,1-biphenyl-3-sulphonate

4'-[[4,5-Dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl]azo]-4-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo]-1,1'-biphenyl-3-sulfonic acid disodium salt