sodium 2-acetoacetylamino-4-[[4-(6-methyl[2,6'-dibenzothiazol]-2'-yl)-2-sulphophenyl]azo]benzenesulphonate

2-[(1,3-Dioxobutyl)amino]-4-[[4-(6-methyl[2,6'-bibenzothiazole]-2'-yl)-2-sulfophenyl]azo]benzenesulfonic acid/sodium,(1:x) salt