You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(1,3-benzodioxol-5-yl)-N-[(2-oxo-3-phenyl-1,3-oxazolidin-5-yl)methyl]prop-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H18N2O5
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