You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-[3-(2,5-dimethoxyanilino)quinoxalin-2-yl]-4-(2H-pyridin-1-ylsulfonyl)benzenesulfonamide is given. What is its corresponding molecular formula?
user
C27H25N5O6S2
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