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}amino)-1-hydroxyethyl]-8-hydroxyquinolin-2(1H)-one, and (ii) a dicarboxylic acid, a sulfonic acid or a sulfimide, or a pharmaceutically acceptable solvate thereof.本發明係為(i) 5-[(1R)-2-({2-[4-(2,2-二氟-2-苯基乙氧基)苯基]乙基}氨基)-1-羥乙基]-8-羥基喹啉-2(1H)-酮(5-[(1R)-2-({2-[4-(2,2-difluoro-2-phenylethoxy)phenyl]ethyl}amino)-1-hydroxyethyl]-8-hydroxyquinolin-2(1H)-one)及(ii) 二羧酸(dicarboxylic acid)、磺酸(sulfonic acid)或磺亞醯胺(sulfimide)之藥學上可接受結晶加成鹽類,或其藥學上可接受溶劑化物。