The present invention addresses the problem of providing a novel compound for the treatment and/or prevention of pain, which has excellent skin penetrability and is less irritative to the skin. The means for solving the problem is a compound of formula (I) or a pharmacologically acceptable salt thereof. (In formula (I), R1 is a methyl group, etc., R2 is a fluorine atom, etc., R3 is a methyl group, etc., R4 is a methyl group, etc., and R5 is a methyl group, etc.)
