You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 2-[(4Z)-4-[(3-chloro-5-methoxy-4-prop-2-ynoxyphenyl)methylidene]-3-methyl-5-oxo-2-sulfanylideneimidazolidin-1-yl]acetate into its molecular formula.
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C18H17ClN2O5S
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