2- {4- [N- (5,6-diphenylpyrazin-2-yl) -N-isopropylamino] butyloxy} acetic acid or 2- {4- [N- (5,6-diphenylpyrazin-2-yl) -Nisopropylamino acid ] butyloxy} -N- (methylsulfonyl) acetamide, or a pharmaceutically acceptable salt thereof, for use in the treatment of inflammatory bowel diseasesÁcido 2-{4-[N-(5,6-difenilpirazin-2-il)-N-isopropilamino]butiloxi}acético o 2-{4-[N-(5,6-difenilpirazin-2-il)-Nisopropylamino] butiloxi}-N-(metilsulfonil)acetamida, o una sal farmacéuticamente aceptable del mismo, para su uso en el tratamiento de enfermedades inflamatorias intestinales