You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-fluorocyclobutyl)-(4-methoxy-5,6,8,9-tetrahydropyrimido[4,5-d]azepin-7-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H18FN3O2
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