You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(4-benzoylpiperazin-1-yl)-5-chlorophenyl]-2-(4-chlorophenoxy)-2-methylpropanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H27Cl2N3O3
assistant