You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-(2,6-dichlorophenyl)imino-5-[(2-ethylquinolin-6-yl)methylidene]-1,3-thiazolidin-4-one is given. What is its corresponding molecular formula?
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C21H15Cl2N3OS
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