You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named N-(2,4-difluorophenyl)-2-[(2S)-3-(3,4-dimethylphenyl)-2',4-dioxospiro[1,3-thiazolidine-2,3'-indole]-1'-yl]acetamide is given. What is its corresponding molecular formula?
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C26H21F2N3O3S
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