A compound that is 8- [5- (1-hydroxy-1-methylethyl) pyridin-3-yl] -1 - [(2S) -2-methoxypropyl] -3-methyl-1,3-dihydro-2H-imidazo [4,5-c] quinolin-2-one, or a pharmaceutically acceptable salt thereof.Un compuesto que es 8-[5-(1-hidroxi-1-metiletil)piridin-3-il]-1-[(2S)-2-metoxipropil]-3-metil-1,3-dihidro-2H-imidazo[4,5-c]quinolin-2-ona, o una de sus sales farmacéuticamente aceptables.