Formoterol Fumarate Impurity A

4-{(1R)-2-[(1R)-2-(p-Methoxyphenyl)-1-methylethylamino]-1-hydroxyethyl}-2-aminophenol

3-Amino-4-hydroxy-α-[[[2-(4-methoxyphenyl)-1-methylethyl]amino]methyl]benzenemethanol

2-Hydroxy-5-[1-hydroxy-2-[[2-(4-methoxyphenyl)-1-methylethyl]amino]ethyl]phenylamine