The molecule is an ammonium ion resulting from the protonation of the non-formylated amino group of (S,S)-formoterol. It is an ammonium ion derivative and an organic cation. It is a conjugate acid of a (S,S)-formoterol. It is an enantiomer of an arformoterol(1+).
[(2S)-2-(3-formamido-4-hydroxyphenyl)-2-hydroxyethyl]-[(2S)-1-(4-methoxyphenyl)propan-2-yl]azanium