Cis-4- {2- [9- (3-Fluorobenzyl) -5,6,8,9-tetrahydro-7H-pyrido [4 ', 3': 4,5] pyrrolo [2,3-b] pyridine acid -7-yl] -2-oxoethyl} cyclohexanecarboxylic or a salt thereof or a solvate thereof.Acido cis-4-{2-[9-(3-fluorobencil)-5,6,8,9-tetrahidro-7H-pirido[4',3':4,5]pirrolo[2,3-b]piridin-7-il]-2- oxoetil}ciclohexanocarboxilico o una sal del mismo o un solvato del mismo.