Cyclopropanecarboxylate derivatives and pharmaceutical composition for preventing and treating acute and chronic neurodegenerative diseases in central nervous system containing said derivatives

A tetrafluorobenzyl derivative represented by the following chemical formula 1: ** ** Formula wherein, R1, R2 and R3 are hydrogen or halogen; R4 is hydroxy, alkyl, alkoxy, halogen, halogen substituted alkanoyloxy or nitro; R5 is carboxylic acid, carboxylic acid ester substituted with C1-C4 alkyl, carboxyamide, sulfonic acid, halogen or nitro; or a pharmaceutically acceptable salt thereof.