You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-(2,3-dihydro-1,4-benzodioxin-3-ylmethyl)-N-(5-fluoro-2-nitrophenyl)piperidin-3-amine into its molecular formula.
user
C20H22FN3O4
assistant