4-[2-(Dipropylamino)ethyl]-1H-indole-2,3-dione Hydrochloride,4-[2-(Dipropylamino)ethyl]-1H-indole-2,3-dione Hydrochloride,"A related impurity of Ropinirole, potentially formed during its synthesis. Useful as antihypertensives and antianginal agents.;Impurity in commercial preparations of Ropinirole",Ropinirole Impurity