Used in organic synthesis as a chiral building block for the development of pharmaceuticals and biologically active compounds. Its strained bicyclic structure and allyl group make it valuable in ring-opening reactions and cycloadditions, particularly in asymmetric synthesis. Commonly employed in the preparation of prostaglandin analogs and other natural products requiring stereochemical control. The oxygen bridge enhances reactivity in acid-catalyzed rearrangements and enables selective functionalization.