4-(propionylamino)-5-[[4-[[2-(sulphooxy)ethyl]sulphonyl]phenyl]azo]anthranilic acid, sodium salt

2-Amino-4-[(1-oxopropyl)amino]-5-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]benzenesulfonic acid/sodium,(1:x) salt