You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,4R)-3,4-difluoro-N-[2-(2-methyloxan-4-yl)ethyl]pyrrolidine-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H22F2N2O2
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