You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[1-[[4-(6,7-dichloro-3-phenyl-4H-quinazolin-2-yl)phenyl]methyl]piperidin-4-yl]-1H-benzimidazol-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H29Cl2N5O
assistant