2-(3-Chlorophenyl)-4-[[5-(ethylsulfonyl)-2-hydroxyphenyl]azo]-2,4-dihydro-5-methyl-3H-pyrazol-3-one

2-(3-chlorophenyl)-4-[[5-(ethylsulphonyl)-2-hydroxyphenyl]azo]-2,4-dihydro-5-methyl-3H-pyrazol-3-one