You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(N-(3,4-dimethoxyphenyl)sulfonyl-4-methoxyanilino)-N-[1-(2-methoxyphenyl)ethyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C26H30N2O7S
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