The present invention is directed to a pharmaceutically acceptable crystalline addition salt of (i) 5-[(1R)-2-({2-[4-(2,2-difluoro-2-phenylethoxy)phenyl]ethyl}amin o)-1-hydroxyethyl]-8-hydroxyquinolin-2(1H)-one, and (ii) a dicarboxylic acid, a sulfonic acid or a sulfimide, or a pharmaceutically acceptable solvate thereof.La presente invención se refiere a una sal de adición, cristalina y farmacéuticamente aceptable, de (i) 5-[(1R)-2-({2-[4-(2,2-difluo ro-2-feniletoxi)fenil]etil}amino)-1-hidroxietil]-8-hidroxiquinoli n-2(1H)-ona, y (ii) un ácido dicarboxílico, un ácido sulfónico o una sulfimida, o un solvato farmacéuticamente aceptable de la misma.
