Formoterol EP Impurity F

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