A succinic acid salt of biphenyl-2-ylcarbamic acid 1-[2-(2-chloro-4-{[(R)-2-hydroxy-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethylamino]methyl}-5-methoxyphenylcarbamoyl)ethyl]piperidin-4-yl ester or a solvate thereof, for use in treating pulmonary disorders.本發明提供適用於治療肺部病症之聯苯-2-基胺基甲酸1-[2-(2-氯-4-{[(R)-2-羥基-2-(8-羥基-2-側氧基-1,2-二氫喹啉-5-基)乙基胺基]甲基}-5-甲氧基苯基胺甲醯基)乙基]哌啶-4-基酯之琥珀酸鹽或其溶劑合物。