Butanoicacid,2-[[4-(6-methyl[2,6'-bibenzothiazol]-2'-yl)-2-sulfophenyl]azo]-3-oxo-,1-ethyl ester,sodium salt (9CI), Butanoicacid,2-[2-[4-(6-methyl[2,6'-bibenzothiazol]-2'-yl)-2-sulfophenyl]diazenyl]-3-oxo-,1-ethyl ester,sodium salt (1:1), EINECS 287-877-5, Sodium 1-ethyl 2-((4-(6-methyl-2,6'-bibenzothiazol-2'-yl)-2-sulphonatophenyl)azo)acetoacetate,