| abstract |
(57) [Summary] (Modified) [Objective] To provide an excellent therapeutic agent for Parkinson's disease. [Structure] General formula (I) [In the formula, R 1 and R 2 are a methyl group or an ethyl group; R 3 is a hydrogen atom, a lower alkyl group, or the like; R 4 is a cycloalkyl, a group- (CH 2) n -R 5 (where, R 5 = aryl group, a heterocyclic group; n = 0 to 4 integer), group -C (Y 1) = CY 2 Z (However, Y 1 , Y 2 = H, halogen, lower alkyl; Z = Aryl group, etc.); X 1 , X 2 represent O, S; And a pharmacologically acceptable salt thereof, and a therapeutic agent for Parkinson's disease containing them as an active ingredient. |