Patent ID: 8293775

Claim:
A method for the symptomatic treatment of Parkinson's disease or dopa-responsive dystonia in a patient, the method comprising administering to the patient an effective amount of a compound according to formula Ia: or a pharmaceutically acceptable salt thereof, wherein R 1 is selected from hydrogen or C 1-4 -alkyl unsubstituted or substituted by hydroxy; R 2 is selected from hydrogen or C 1-4 -alkyl unsubstituted or substituted by hydroxy; R 3 is selected from hydrogen or unsubstituted C 1-4 -alkyl; R 3a is selected from hydrogen or unsubstituted C 1-4 -alkyl; R 4 is selected from hydrogen, halogen, or C 1-4 -alkoxy unsubstituted or substituted by a phenyl group; R 5 is selected from hydrogen, halogen, or C 1-4 -alkoxy unsubstituted or substituted by a phenyl group; R 6 is selected from hydrogen, halogen, or C 1-4 -alkoxy unsubstituted or substituted by a phenyl group; and R 7 is selected from hydrogen, halogen, or C 1-4 -alkoxy unsubstituted or substituted by a phenyl group; with the proviso that the compound is not 2-(6-bromo-2-oxo-1,3-benzoxazol-3(2H)-yl)acetamide.