Salbutamol. Computer model of a molecule of the drug salbutamol. It is also known as albuterol, and is sold under the brand name Ventolin. It is a bronchodilator drug, used to treat asthma. The molecule's chemical formula is C13.H21.N.O3. Atoms (spheres) are colour-coded: carbon (grey), hydrogen (light blue), nitrogen (dark blue), oxygen (orange).