| abstract |
Provided is a fluorine-containing carboxylic acid derivative useful as an active ingredient of a medicine for the prevention and / or treatment of pain such as chronic pain including various neuropathic pains. A fluorine-containing carboxylic acid derivative represented by the general formula (I), or a salt or ester thereof. (R1 is a C1-5 alkyl group substituted with at least one fluorine atom (eg 2-fluoroethyl group, 2,2-difluoroethyl group etc.); R2 and R3 are each independently H, alkyl group, Alkenyl group or acyl group) [Selection] None |