Mirabegron Impurity B

(R)-N-(4-(2-(2-Aminothiazol-4-yl)acetamido)phenethyl)-2-hydroxy-2-phenylacetamide; 
2-Amino-N-[4-[2-[[(2R)-2-hydroxy-2-phenylacetyl]amino]ethyl]phenyl]-4-Thiazoleacetamide; 2-Oxo Mirabegron;