The choline salt of the CD80 antagonist compound 4-(6-fluoro-3-oxo-1,3-dihydro-pyrazolo[4,3-c]cinnolin-2-yl)-N-(2,2-difluoro-ethyl)-benzamide (I) has good aqueous solubility and is therefore convenient for pharmaceutical use.CD80 길항물질 화합물 4-(6-플루오로-3-옥소-1,3-디하이드로-피라졸로[4,3-C]신놀린-2-일)-N-(2,2-디플루오로-에틸)-벤즈아미드의 콜린염은 양호한 수용성을 가지므로서 약학적 용도로서 편리하다.