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 3-butyl-5-[2-[5-chloro-3-(2-hydroxyethyl)-1,3-benzothiazol-2-ylidene]ethylidene]-2-sulfanylidene-1,3-thiazolidin-4-one is given. What is its corresponding molecular formula?
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C18H19ClN2O2S3
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