2,5-Dichloro-4-[[4,5-dihydro-3-methyl-5-oxo-4-[[3-[(phenylamino)sulfonyl]phenyl]azo]-1H-pyrazol]-1-yl]benzenesulfonic acid

2,5-dichloro-4-[4,5-dihydro-3-methyl-5-oxo-4-[[3-[(phenylamino)sulphonyl]phenyl]azo]-1H-pyrazol-1-yl]benzenesulphonic acid