107072-33-3 5,7-Dimethyl-2-sulfothiazolo(3,2-a)pyrimidin-4-ium hydroxide 5,7-Dimethylthiazolo(3,2,-a)pyrimidin-4-ium-2-sulfonate Thiazolo(3,2-a)pyrimidin-4-ium, 5,7-dimethyl-2-sulfo-, hydroxide