Formoterol EP Impurity E;Formoterol EP Impurity E (Mixture of Diastereomers);Formoterol Impurity 5(Formoterol EP Impurity E);Formoterol impurity 5/Formoterol EP Impurity E(Mixture of Diastereomers)/N-(2-Hydroxy-5-(1-hydroxy-2-((1-(4-methoxy-3-methylphenyl)propan-2-yl)amino)ethyl)phenyl)formamide;Formamide, N-[2-hydroxy-5-[1-hydroxy-2-[[2-(4-methoxy-3-methylphenyl)-1-methylethyl]amino]ethyl]phenyl]-;Formoterol Impurity E (Mixture of Diastereomers);Formoterol Fumarate EP Impurity E