| abstract |
Formula (1) which shows the therapeutic effect or preventive action with respect to diseases in which SNS such as neuropathic pain is involved: [Wherein, R 1 and R 2 independently represent an alkyl group having 1 to 4 carbon atoms, or R 1 and R 2 may be bonded to form a 5- to 7-membered ring; Represents 1-3, A represents a substituted or unsubstituted aryl group or the like, or represents a formula: —N (R 5 ) R 6 (wherein R 5 and R 6 are independently substituted) Or represents an unsubstituted alkyl group, etc.), R 3 and R 4 independently represent a substituted or unsubstituted alkyl group or the like, or R 3 and R 4 are bonded to form a substituted or unsubstituted group. A saturated or unsaturated nitrogen-containing heterocycle may be formed. However, when R 3 and R 4 are combined to form a piperidine ring, R 1 and R 2 are not hydrogen atoms at the same time. ] Or a pharmaceutically acceptable salt thereof. |