You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named tert-butyl 5-bromo-1'-(cyclopropanecarbonyl)-2-oxospiro[indole-3,2'-pyrrolidine]-1-carboxylate;1'-(cyclopropanecarbonyl)-1-methyl-5-[9-methyl-8-(2-methylpyrimidin-5-yl)purin-6-yl]spiro[indole-3,2'-pyrrolidine]-2-one;1'-(cyclopropanecarbonyl)-5-[9-methyl-8-(2-methylpyrimidin-5-yl)purin-6-yl]spiro[1H-indole-3,2'-pyrrolidine]-2-one by IUPAC nomenclature, provide its molecular formula.
user
C113H119Br3N22O16
assistant