You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[1'-benzoyl-7-(3,4-dimethoxyphenyl)-4-oxospiro[3H-chromene-2,4'-piperidine]-3-yl]propanenitrile by IUPAC nomenclature, provide its molecular formula.
user
C31H30N2O5
assistant