An atropisomer of a compound represented by the following general formula (I): ** Formula ** in which R1 is a methyl group or a 2-hydroxyethyl group； and R2 10 is a hydrogen atom or a methoxy group, selected from: (-) - 1- (2-hydroxyethyl) -4-methyl-N- [4- (methylsulfonyl) phenyl] -5- [2- ( trifluoromethyl) phenyl] -1H-pyrrole-3-carboxamide, (+) - 1,4-dimethyl-N- [4- (methylsulfonyl) phenyl] -5- [2- (trifluoromethyl) phenyl] -1H-pyrrole-3 -carboxamide； and (-) - 1- (2-hydroxyethyl) -5- [4-methoxy-2- (trifluoromethyl) phenyl] -4-methyl-N- [4- (methylsulfonyl) phenyl] -1H-pyrrole-3-carboxamide .Un atropisómero de un compuesto representado por la fórmula general (I) siguiente:**Fórmula** en la que R1 es un grupo metilo o un grupo 2-hidroxietilo； y R2 10 es un átomo de hidrógeno o un grupo metoxi,seleccionado de entre: (-)-1-(2-hidroxietil)-4-metil-N-[4-(metilsulfonil)fenil]-5-[2-(trifluorometil)fenil]-1H-pirrol-3-carboxamida, (+)-1,4-dimetil-N-[4-(metilsulfonil)fenil]-5-[2-(trifluorometil)fenil]-1H-pirrol-3-carboxamida； y (-)-1-(2-hidroxietil)-5-[4-metoxi-2-(trifluorometil)fenil]-4-metil-N-[4-(metilsulfonil)fenil]-1H-pirrol-3-carboxamida.
