You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-benzyl-2-(3,4-dichlorophenyl)-N'-[2-(diethylamino)ethyl]benzimidazole-5-carboximidamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H29Cl2N5
assistant