| abstract |
The invention provides a compound for the treatment or prophylaxis of pathology involving SNS, specifically diseases such as neuropathic pain, nociceptive pain, dysuria, multiple sclerosis and the like. The compound is represented by formula (1) or a pharmaceutically acceptable salt thereof wherein R 1 is a hydrogen atom or the like, L is a single bond, —O— or the like, R 2 is a phenyl group or the like, X is a carbon atom or a nitrogen atom, and R 3 , R 4 , R 5a , R 5b , R 6 and R 7 are each independently a substituted or unsubstituted alkyl group or the like: |