You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1,5-dibenzyl-4-oxo-2,3-dihydro-1,5-benzodiazepin-3-yl)-N-(4-fluorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H28FN3O2
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