entacapone

noun

en·​tac·​a·​pone en-ˈtak-ə-ˌpōn 

: a drug C₁₄H₁₅N₃O₅ that inhibits the breakdown of L-dopa and is used in conjunction with L-dopa and carbidopa in the treatment of Parkinson's disease

Note: Entacapone is marketed under the trademark Comtan and when used in conjunction with carbidopa and L-dopa, under the trademark Stalevo.