You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-chloro-N-[(4-chloro-1H-benzimidazol-5-yl)methyl]-4-[(5-cyclopropylpyrazolidin-3-ylidene)amino]pyrimidin-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H18Cl2N8
assistant