You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(2,4-dimethoxyphenyl)-N-[2-[4-(2-fluorophenyl)piperazin-1-yl]-2-oxoethyl]benzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C26H28FN3O5S
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