You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[2-[N-(benzenesulfonyl)-3,4-dichloroanilino]acetyl]-[(2,4-dichlorophenyl)methyl]amino]-N-ethylbutanamide into its molecular formula.
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C27H27Cl4N3O4S
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