Name of the compound

Observed molecular weight (m/z)

Theoretical

mass

Chemical

formula

Molecular ion with adduct

Arformoterol

345.1451

344.4048

C19H24N2O4

(M + H)+

Amine Impurity

317.1821

316.3947

C18H24N2O3

(M + H)+

Secondary degradant

329.1908

328.4054

C19H24N2O3

(M + H)+