(S,S)-Formoterol
(S,S)-formoterol is an N-[2-hydroxy-5-(1-hydroxy-2-{[1-(4-methoxyphenyl)propan-2-yl]amino}ethyl)phenyl]formamide in which both of the stereocentres have S configuration. It is a conjugate base of a (S,S)-formoterol(1+). It is an enantiomer of an arformoterol.