You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[4-(4-methoxyphenyl)piperazin-1-yl]propyl]-4-(4-methylphenyl)-1-oxoisochromene-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H33N3O4
assistant