You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-(2-chlorophenyl)-1-(4-chlorophenyl)-5-[(E)-hydrazinylidenemethyl]imidazole-4-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16Cl2N4O2
assistant