You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named ethyl 2-[(5S,7S)-6-tert-butylsulfinyl-7-(trifluoromethyl)-5,7-dihydro-[1,3]dioxolo[4,5-f]isoindol-5-yl]acetate by IUPAC nomenclature, provide its molecular formula.
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C18H22F3NO5S
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