1-(4-(2-Methoxyphenyl)thiazol-2-yl)guanidine Hydrobromide is used in the preparation of antiulcer agents, specifically 4-Substituted 2-guanidinothiazoles, which are reversible, competitive, and selective inhibitors of gastric H+,K+-ATPase. It is also used in the preparation of guanidinothiazole derivatives as Maillard reaction inhibitors and antioxidants.