9-Ethyl-6,6-dimethyl-8- (4-morpholin-4-yl-piperidin-1-yl) -11-oxo-6,11-dihydro-5H-benzo [b] carbazol-3-carbonitrile or a salt or a solvate thereof.9-Etil-6,6-dimetil-8-(4-morfolin-4-il-piperidin-1-il)-11-oxo-6,11-dihidro-5H-benzo[b]carbazol-3-carbonitrilo o una sal o un solvato del mismo.