You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(furan-2-ylmethyl)-4-methyl-N-[2-oxo-2-[4-(2-phenoxyethyl)piperazin-1-yl]ethyl]benzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
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C26H31N3O5S
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