You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,4-dimethoxy-N-methyl-N-[[5-[(1R,2R)-2-methylcyclopropyl]furan-2-yl]methyl]benzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23NO5S
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