4-((6-Methylbenzothiazol-2-yl)azo)-N-ethyl-N-(2-sulfoethyl)-m-toluidine, potassium salt 71673-05-7 EINECS 275-828-0 Ethanesulfonic acid, 2-(ethyl(3-methyl-4-((6-methyl-2-benzothiazolyl)azo)phenyl)amino)-, potassium salt Potassium 2-(ethyl(3-methyl-4-((6-methyl-2-benzothiazolyl)azo)phenyl)amino)ethanesulphonate