| 摘要 |
compound of formula (I), wherein: R1 is selected from any one of phenyl, pyridinyl, thienyl, furanyl, imidazolyl, and triazolyl; where each R1 phenyl ring and R1 heteroaromatic ring may optionally and independently be further substituted by 1, 2 or 3 substituents selected from straight and branched C1-C6 alkyl, NO2, CF3, C1-C6 alkoxy, chloro, fluoro, bromo, and iodo. The substitutions on the phenyl ring and on the heteroaromatic ring may take place in any position on said ring systems; Ra and Rb is each and individually selected from any one of hydrogen, a straight and branched C1-C6 alkyl, NO2, CF3, C1-C6 alkoxy, chloro, fluoro, bromo, and iodo; as well as their pharmaceutically acceptable salts and pharmaceutical compositions comprising these compounds and their use in therapy, in particular in the management of pain is disclosed.
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