1-decyl 2-[[1-(2-chloro-5-sulphophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]benzoate

3-[[4-[2-(Decyloxycarbonyl)phenylazo]-5-oxo-4,5-dihydro-3-methyl-1H-pyrazol]-1-yl]-4-chlorobenzenesulfonic acid