| 摘要 |
A compound of formula (I): <CHEM> or a salt and/or solvate thereof, wherein R represents an acyl group containing a substituted or unsubstituted carbocyclic aromatic or heterocyclic aromatic group; R<1> and R<2> each independently represents an alkyl, alkenyl or alkynyl group or R<1> together with R<2> represents a C 3-6 polymethylene or alkenylene group; R<3> represents hydrogen or alkyl; R<4> represents hydrogen, halogen, alkyl, hydroxy, alkoxy, nitrile, nitro, amino or mono or disubstituted amino; and n represents O or an integer 1, is useful in the treatment of pain. |
