You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-(6-methoxyspiro[3,4-dihydroisochromene-1,4'-piperidine]-1'-carbonyl)-4,6-dimethyl-1H-pyridin-2-one .
user
C22H26N2O4
assistant