| abstract |
A compound represented by the formula: wherein Ar1 and Ar independently represent an optionally substituted aromatic group; Q represents an optionally substituted divalent aliphatic hydrocarbon group optionally containing O or S; R1 represents H, acyl group, etc.; and X represents an electron-withdrawing group, an optionally substituted aromatic group, a group of the formula: wherein R and R3 independently represent H, acyl group or an optionally substituted hydrocarbon group, etc., etc.; or salts thereof are useful as an excellent anti-neurodegenerative agent. |