| abstract |
A compound represented by the formula (1) or a pharmaceutically acceptable salt thereof which has a therapeutic or prophylactic effect on an SNS-related disease such as neuropathic pain. (1) wherein R 1 and R 2 independently represent an alkyl group having 1 to 4 carbon atoms or the like, or R 1 and R 2 may together form a 5- to 7-membered ring; n represents a numerical number of 1 to 3; A represents a substituted or unsubstituted aryl group or the like or a formula: -N(R 5 )R 6 (wherein R 5 and R 6 independently represent a substituted or unsubstituted alkyl group or the like); and R 3 and R 4 independently represent a sustituted or unsubstituted alkyl group or the like, or R 3 and R 4 may together form a substituted or unsubstituted, saturated or unsubstituted nitrogenated heterocyclic ring, provided that both of R 1 and R 2 are not a hydrogen atom when R 3 and R 4 together form a piperidine ring. |