You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-(3-chlorophenyl)-2-(4-chlorophenyl)-3-(3-chlorophenyl)sulfanyl-4-hydroxy-2H-pyrrol-5-one by IUPAC nomenclature, provide its molecular formula.
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C22H14Cl3NO2S
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