| abstract |
The present invention relates to a compound of the formula: <CHEM> wherein Ar represents an optionally substituted aromatic group; Q represents a divalent aliphatic hydrocarbon group; R<1> represents hydrogen, cyano, an optionally substituted hydrocarbon group, a group of the formula: <CHEM> wherein R<3> and R<4> independently represent hydrogen, acyl or an optionally substituted hydrocarbon group, or R<3> and R<4> jointly form a ring, or acyl; R<2> represents acyl; ......... represents a single bond or a double bond; m represents 1 or 2 or a salt, a process of producing-thereof and an anti-neurodegenerative composition. |