You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[7-chloro-2-oxo-5-(trifluoromethyl)-3,5-dihydro-1H-1,4-benzodiazepin-4-yl]methyl]benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H13ClF3N3O
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