1-(Ethylamino)-3-[4-(2-methoxyethyl)phenoxy]-2-propanol;C-Desmethyl Metoprolol;H 173/09;2-Ethylamino-1-[4-(2-methoxyethyl)phenoxy]ethanol;Metoprolol Tartrate EP IMpurity-A (USP RC A);(2RS)-1-(Ethylamino)-3-[4-(2-methoxyethyl)phenoxy]propan-2-ol;Metoprolol EP Impurity -A (USP RC A);Metoprolol Impurity 1(Metoprolol EP Impurity A)