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DescriptionArformoterol tartrate is a salt of Arformoterol, the (R,R)-enantiomer of formoterol. Arformoterol is a selective beta 2-adrenergic bronchodilator. It has two-fold greater potency than racemic formoterol which contains both the (S,S) and (R,R)-enantiomers. The (S,S)-enantiomer is about 1,0..