The β-adrenergic agonist 1 (zilpaterol) is used as production enhancer in cattle. Binding experiments of separated enantiomers on recombinant human β2-adrenergic and μ-opioid receptors and functional studies showed that the (−)-1 enantiomer accounts for essentially all the β2-adrenergic agonist activity and that it exhibits less affinity toward the μ-opioid receptor than (+)-1, which is a μ-opioid receptor antagonist. X-ray crystallography ...
![(6S,7S)-4,5,6,7-tetrahydro-7-hydroxy-6-[(1-methylethyl)amino]imidazo[4,5,1-jk][1]benzazepin-2(1H)-one Structure](https://image.chemsrc.com/caspic/467/1001395-75-0.png)
![(6S,7S)-7-Hydroxy-6-(isopropylamino)-4,5,6,7-tetrahydroimidazo[4, 5,1-jk][1]benzazepin-2(1H)-one hydrochloride (1:1) Structure](https://image.chemsrc.com/caspic/245/1117752-22-3.png)