You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[1-(2,3-dihydro-1,4-benzodioxin-6-yl)ethylcarbamoylamino]ethyl]-2-(3-fluorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24FN3O4
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