2-((4-((2-Hydroxyethyl)methylamino)phenyl)azo)-6-methoxy-3-methylbenzothiazolium, methyl sulfate 72089-19-1 Benzothiazolium, 2-((4-((2-hydroxyethyl)methylamino)phenyl)azo)-6-methoxy-3-methyl-, methyl sulfate (salt)