Atorvastatin. Computer model of a molecule of the drug atorvastatin. It is sold under the brand name Lipitor. It is a statin drug, used to treat the high cholesterol levels that cause heart and vascular disease. The molecule's chemical formula is C33.H34.F.N2.O5. Atoms (spheres) are colour- coded: carbon (grey), hydrogen (light blue), fluorine (green), nitrogen (dark blue), oxygen (orange).