3-Ethyl-5-(2-hydroxyethyl)-4-methylthiazolium Bromide

3-Ethyl-5-(2-hydroxyethyl)-4-methylthiazolium bromide is a quaternary ammonium salt and a thiazolium compound derived from thiazole. It is structurally related to thiamine (vitamin B₁) and often serves as a precursor or analog in biochemical and synthetic studies, particularly in reactions involving thiamine pyrophosphate (TPP)-dependent enzymes. The compound contains a thiazolium ring substituted with ethyl, methyl, and hydroxyethyl groups, and its bromide ion serves as the counterion. It’s commonly used in research on enzymatic catalysis and organic synthesis involving thiazolium-based catalysts.