2-[(1S)-1'-[(3S,4R)-1-tert-butyl-4-(2,4-difluorophenyl)pyrrolidine-3-carbonyl]-5-chloro-6-methylspiro[1,2-dihydroindene-3,4'-piperidine]-1-yl]-2-methyl-1-[(1S,4S)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl]propan-1-one