(1R，3S，4S)-3-(6-(7-(2-((S)-5-(叔丁氧基羰基)-5-氮杂螺[2.4]庚烷-6-基)咪唑-5-基)-9，9-二氟-9H-芴-2-基)-1H-苯并[d]咪唑-2-基)-2-氮杂二环[2.2.1]庚烷-2-羧酸乙酯草酸盐 (1R，3S，4S)-tert-Butyl 3-(6-(7-(2-((S)-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptan-6-yl)-1H-imidazol-5-yl)-9，9-difluoro-9H-fluoren-2-yl)-1H-benzo[d]imidazol-2-yl)-2-azabicyclo[2.2.1]heptane-2-carboxylate oxalate