disodium 4-[[4-(2,3-dichloroquinoxaline-6-carboxamido)-2-sulphonatophenyl]azo]-3-methyl-5-oxo-2-pyrazolin-1-acetate

4-[[4-[(2,3-Dichloroquinoxalin-6-yl)carbonylamino]-2-(sodiosulfo)phenyl]azo]-3-methyl-5-oxo-2-pyrazoline-1-acetic acid sodium salt