| 摘要 |
A compound of formula 1, or a solvate or salt thereof: <IMAGE> I in which: RCO is an acyl group in which the group R comprises a substituted or unsubstituted carbocyclic or heterocyclic aromatic ring and R1 and R2 are independently C1-6 alkyl groups or together form a C3-6 polymethylene or alkenylene group, is useful for treating pain. |
