You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[2-[3-(furan-2-yl)-6-oxopyridazin-1-yl]ethyl]-4-methoxy-2,3,5-trimethylbenzenesulfonamide into its molecular formula.
user
C20H23N3O5S
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