You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3S,3'S,5'R)-7-chloro-N-(4-methoxyphenyl)-5-methyl-2-oxo-5'-propan-2-ylspiro[1H-indole-3,2'-pyrrolidine]-3'-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C23H26ClN3O3
assistant