| abstract |
Described are derivatives of formula (I) wherein R 1 is selected from the group consisting of phenyl, pyridinyl, thiophenyl, furanyl and imidazolyl; wherein each phenyl ring and the heteroaromatic ring is optionally and independently further substituted with one, two or three substituents selected from the group consisting of linear and branched C 1 -C 6 -alkyl, NO 2, CF 3, C 1 -C 6 -alkoxy, chloro, fluoro, bromine and iodine. Also disclosed and protected are pharmaceutically acceptable salts, pharmaceutical compositions containing the novel compounds, and their use in the treatment of, in particular, the treatment of pain. |