You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(5-chloro-2-hydroxyphenyl)-4-[(5Z)-5-(furan-2-ylmethylidene)-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]butanamide into its molecular formula.
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C18H15ClN2O4S2
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