2,4-Dihydro-4-[[2-hydroxy-5-(methylsulfonyl)-4-nitrophenyl]azo]-5-methyl-2-phenyl-3H-pyrazol-3-one

2,4-dihydro-4-[[2-hydroxy-5-(methylsulphonyl)-4-nitrophenyl]azo]-5-methyl-2-phenyl-3H-pyrazol-3-one