You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-N-(4-chloro-2-methylphenyl)-2-N-[(4-fluorophenyl)methyl]cyclopropane-1,2-dicarboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H18ClFN2O2
assistant