lubiprostone

noun

lu·​bi·​pros·​tone ˌlü-bə-ˈpräs-ˌtōn 

: a laxative drug C₂₀H₃₂F₂O₅ taken orally in the treatment of chronic constipation and irritable bowel syndrome with constipation

Note: Lubiprostone is marketed under the trademark Amitiza.