N-(4-(2-(((R)-2-Hydroxy-2-phenylethyl)amino)ethyl)phenyl)-2-(1-oxido-2-oxo-2,3-dihydrothiazol-4-yl)acetamide is an impurity of Mirabegron (M364900); a potent bladder relaxant and reagent for diabetes remedy. Molecular Formula: C21H23N3O4S Molecular Weight: 413.49