Durezol (difuprednate ophthalmic emulsion) 0.05% is a sterile, topical anti-infammatory corticosteroid for ophthalmic use. The chemical name is 6?,9-difuoro-11?,17,21-trihydroxypregna-1,4-diene-3,20-dione 21-acetate 17-butyrate (CAS number 23674-86-4). Difuprednate is represented by the following structural formula: