You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[6-[(3-fluorophenyl)methyl]-1,4-oxazepan-4-yl]-(2-methyl-1,3-oxazol-4-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H19FN2O3
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