Calcipotriol is a seco-cholestane that is 26,27-cyclo-9,10-secocholesta-5,7,10,22-tetraene carrying additional hydroxy substituents at positions 1, 3 and 24. It is used (as its hydrate) in combination with betamethasone dipropionate, a corticosteroid, for the topical treatment of plaque psoriasis in adult patients. It has a role as a drug allergen and an antipsoriatic. It is a member of cyclopropanes, a secondary alcohol, a triol, a hydroxy seco-steroid and a seco-cholestane.