Formoterol EP Impurity E

Chemical Name: N-[2-Hydroxy-5-[1-hydroxy-2-[[2-(4-methoxy-3-methylphenyl)-1-methylethyl]amino]ethyl]phenyl]formamide (as per EP); N-[2-Hydroxy-5-(1-hydroxy-2-{[1-(4-methoxy-3-methylphenyl)propan-2-yl]amino}ethyl)phenyl]formamide (as per USP)

Synonym: 3-Methyl formoterol (USP)