A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Metoprolol Metoprolol EP Impurity A Metoprolol EP Impurity B Metoprolol EP Impurity C Metoprolol EP Impurity D Metoprolol EP Impurity O Metoprolol Methoxy Epoxide Impurity Metoprolol USP Related Compound B