(R)-tert-butyl 8-(3,5-difluorophenyl)-10-oxo-9-(2-oxo-2-((R)-2'-oxo-1,1',2',3-tetrahydrospiro[indene-2,3'-pyrrolo[2,3-b]pyridine]-5-ylamino)ethyl)-6,9-diazaspiro[4.5]decane-6-carboxylate