You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(3,4-dimethoxyphenyl)ethyl]-1-[2-(4-methylanilino)-2-oxoethyl]piperidine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H33N3O4
assistant