Compounds of formula I or pharmaceutically acceptable salts thereof: Formula (I) wherein R
1
, R
2
, R
3
and R
8
are as defined in the specification as well as salts and pharmaceutical compositions including the compounds are prepared. They are useful in therapy, in particular in the management of pain.
[EN] Compounds of formula I or pharmaceutically acceptable salts thereof: Formula (I) wherein R1, R2, R3 and R8 are as defined in the specification as well as salts and pharmaceutical compositions including the compounds are prepared. They are useful in therapy, in particular in the management of pain. [FR] L'invention concerne la préparation de composés de formule I ou des sels acceptables sur le plan pharmaceutique de ceux-ci: dans laquelle R1, R2, R3 et R8 sont tels que définis dans la description, ainsi que des sels et des compositions pharmaceutiques renfermant les composés. Ces composés sont utiles dans un traitement, notamment dans le soulagement de la douleur.