text: <unk>  (INN) or levalbuterol (USAN), trade name Xopenex, is the R-enantiomer of the short-acting β2-adrenergic receptor agonist albuterol (salbutamol).
option_0: Levosalbutamol
option_1: Xamoterol
option_2: Formoterol
option_3: Seratrodast
option_4: Cromolyn 
option_5: Zafirlukast
option_6: Tulobuterol
option_7: Arformoterol tartrate