Synonyms: (S)-2-(2-Aminothiazol-4-yl)-N-(4-(2-((2-hydroxy-2-phenylethyl)amino)ethyl)phenyl)acetamide, Mirabegron Impurity 1, ent-Mirabegron, 4-Thiazoleacetamide, 2-amino-N-[4-[2-[[(2S)-2-hydroxy-2-phenylethyl]amino]ethyl]phenyl]-, 2-Amino-N-[4-[2-[[(2S)-2-hydroxy-2-phenylethyl]amino]ethyl]phenyl]-4-thiazoleacetamide, 2-(2-Amino-1,3-thiazol-4-yl)-N-[4-[2-[((2S)-2-hydroxy-2-phenylethyl)amino]ethyl]phenyl]acetamide