You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[5-(azepan-1-ylmethyl)tetrazol-1-yl]-1-[3-(4-fluorophenyl)pyrrolidin-1-yl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H27FN6O
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