2,7-Naphthalenedisulfonic acid, 4-((3-((3-(4,5-dihydro-3-methyl-5-oxo-4-((4-sulfophenyl)azo)-1H-pyrazol-1-yl)phenyl)azo)-2,4-dihydroxyphenyl)azo)-5-hydroxy-6-(phenylazo)- 68134-18-9