6-cyclopropylmethoxy-5-(3,3-difluoro-azetidin-1-yl)-pyrazine-2-carboxylic acid 、
(R)-N,N-Dimethylpyrrolidine-2-carbothioamide 以isolated (19 mg, 25.6%) as off white solid的产率得到(R)-1-[6-cyclopropylmethoxy-5-(3,3-difluoroazetidin-1-yl)pyrazine-2-carbonyl]pyrrolidine-2-carbothioic acid dimethylamide