Formoterol EP Impurity B

N-(2-hydroxy-5-(1-hydroxy-2-((1-(4-methoxyphenyl)propan-2-yl)amino)ethyl)phenyl)acetamide

N-(5-(2-(benzyl(1-(4-methoxyphenyl)propan-2-yl)amino)-1-hydroxyethyl)-2-hydroxyphenyl)formamide

Formoterol Dimer; 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