Formetrol Impurity AFormoterol EP Impurity AFormoterol Related Compound AFormoterol EP A(Mixture of Diastereomers)Formoterol Fumarate Dihydrate - Impurity AFormoterol Impurity 1(Mixture of Diastereomers)Formoterol Impurity 1(Formoterol EP Impurity A)Formoterol Impurity A (Mixture of Diastereomers)Formoterol EP Impurity A (Mixture of Diastereomers)Formoterol EP Impurity A (Formoterol USP Related Compound A)