Cinnamoyl piperazine derivatives and their use as antagonists pair-1.

Compounds of general formula (I): ** (See formula) ** I wherein: 10 R1 represents: halogen, CN or NO2; 15 R2 represents: hydrogen or halogen; n represents 1 or 2; R3 represents: phenyl substituted by 25 one or more halogens or C1-C6 alkyls; or a cyclohexyl; and therapeutically acceptable salts or solvates thereof.