You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (4S,5S)-5-[1-(3-fluorophenyl)pyrrol-2-yl]-1-[(4-methoxyphenyl)methyl]-4-pyridin-2-ylimidazolidine-2-thione by IUPAC nomenclature, provide its molecular formula.
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C26H23FN4OS
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