You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 7-chloro-2-[[[4-(difluoromethoxy)phenyl]methyl-methylamino]methyl]-3H-quinazolin-4-one is given. What is its corresponding molecular formula?
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C18H16ClF2N3O2
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