You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-acetyl-5-methylfuran-2-yl)-N-[(1S)-1,2,3,4-tetrahydronaphthalen-1-yl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23NO3
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