Fluticasone. Molecular model of the synthetic steroid hormone fluticasone (C22.H27.F3.O4.S), a chemical that binds to the glucocorticoid receptor. As the drug fluticasone propionate, it is used to treat asthma and hay fever. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), oxygen (red), sulphur (yellow) and fluorine (cyan).