Mirabegron Impurity 20

2-(1-Oxido-2-oxo-2,3-dihydrothiazol-4-yl)-N-(4-(2-((2-oxo-2-phenylethyl)amino)ethyl)phenyl)acetamide; 
4-Thiazoleacetamide, 2,3-dihydro-2-oxo-N-[4-[2-[(2-oxo-2-phenylethyl)amino]ethyl]phenyl]-, 1-oxide; Acetamide, 2-(1-oxido-2-oxo-2,3-dihydrothiazol-4-yl)-N-(4-(2-((2-oxo-2-phenylethyl)amino)ethyl)phenyl);