You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclopropyl-4-[3-[(3,4-dichlorophenyl)methyl-ethylamino]-3-oxoprop-1-enyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22Cl2N2O2
assistant