Synonyms: 2,5-dichloro-4-[4,5-dihydro-3-methyl-5-oxo-4-[[3-[[(phenylsulphonyl)amino]sulphonyl]phenyl]azo]-1H-pyrazol-1-yl]benzenesulphonic acid, sodium salt;2,5-Dichloro-4-[[4,5-dihydro-3-methyl-5-oxo-4-[3-[[(phenylsulfonyl)amino]sulfonyl]phenylazo]-1H-pyrazole]-1-yl]benzenesulfonic acid/sodium,(1:x) salt;2,5-Dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-((3-(((phenylsulphonyl)amino)sulphonyl)phenyl)azo)-1H-pyrazol-1-yl)benzenesulphonic acid, sodium salt;Einecs 280-150-3