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(S,S)-Formoterol ((+)-Formoterol) is a (S,S)-enantiomer of Formoterol. (S,S)-Formoterol can promote asthma by enhancing IL-4 production in mast cells of the asthmatic airway[1].

ChEBI: (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.

[1] Abraha D, et, al. (S,S)-formoterol increases the production of IL-4 in mast cells and the airways of a murine asthma model. Int Arch Allergy Immunol. 2004 Apr;133(4):380-8. DOI:10.1159/000077358
[2] Jensen O, et, al. Stereoselective cell uptake of adrenergic agonists and antagonists by organic cation transporters. Biochem Pharmacol. 2020 Jan;171:113731. DOI:10.1016/j.bcp.2019.113731