You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-[(Z)-[(E)-1,3-bis(4-chlorophenyl)-3-imidazol-1-ylprop-2-enylidene]amino]guanidine ?
user
C19H16Cl2N6
assistant