4-(5-bromo-2-(trifluoromethoxy)benzylamino)-2-chloro-5-nitropyrimidine 、
(S)-1-Boc-3-氨甲基吡咯烷 以Intermediate 16 was thereby isolated as a white solid in 75% yield的产率得到(S)-tert-butyl 3-((4-(5-bromo-2-(trifluoromethoxy)benzylamino)-5-nitropyrimidin-2-ylamino)methyl)pyrrolidine-1-carboxylate