3-ethoxycarbonyl-7-(2-fluoro-5-methylphenylamino)pyrazolo[1,5-a]pyrimidine-6-carboxylic acid 、
4-(2,4-二氟苯基)哌啶盐酸盐(1:1) 以the title compound (117 mg, 47%) was obtained的产率得到6-[4-(2,4-difluorophenyl)piperidine-1-carbonyl]-3-ethoxycarbonyl-7-(2-fluoro-5-methylphenylamino)pyrazolo[1,5-a]pyrimidine