You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1',5-dimethyl-N-(4-propan-2-ylphenyl)spiro[2H-indole-3,4'-piperidine]-1-carboxamide using the IUPAC nomenclature.
user
C24H31N3O
assistant