You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (5Z)-5-[[5-bromo-1-[(4-chlorophenyl)methyl]indol-3-yl]methylidene]-3-(3,4-dimethylphenyl)-2-sulfanylideneimidazolidin-4-one by IUPAC nomenclature, provide its molecular formula.
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C27H21BrClN3OS
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