You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4S,5S)-5-[1-(3-chlorophenyl)pyrrol-2-yl]-1-[4-(4-methoxyphenoxy)phenyl]-4-pyridin-2-ylimidazolidine-2-thione by IUPAC nomenclature, provide its molecular formula.
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C31H25ClN4O2S
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