You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-7-[1-oxo-1-(4-phenylpiperazin-1-yl)propan-2-yl]oxy-3-phenylchromen-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C29H28N2O4
assistant