Ball-and-stick model of ("R")-(−)-salbutamol or ("R")-(−)-albuterol (also known as levosalbutamol or levalbuterol, brand name "Xopenex") — a short-acting β2 agonist used in the treatment of asthma and COPD. Created using Accelrys DS Visualizer 4.1 and Adobe Photoshop CC 2015.