Nose drops such as betamethasone. These are used for conditions such birli hay fever, allergies and nasal polyps. The letters α and β[18] denote absolute stereochemistry at chiral centers—a specific nomenclature distinct from the R/S convention[19] of organic chemistry to denote absolute configuration of functional groups, known as Cahn–Ingold–Prelog priority http://pilomaterial.info/user/fishcat2/