You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-[(4aR,9bS)-2,8-dimethyl-3,4,4a,9b-tetrahydro-1H-pyrido[4,3-b]indole-5-carbonyl]-2,4-dichloro-N-(3-chlorophenyl)benzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
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C26H24Cl3N3O3S
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