You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(4-fluorophenyl)ethyl]-5,5-dioxo-2,3-dihydro-1H-pyrrolo[2,1-c][1,4]benzothiazine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H19FN2O3S
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