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 N-(benzylcarbamoyl)-2-(7-chloro-4-oxo-3-prop-2-enylquinazolin-2-yl)sulfanylacetamide is given. What is its corresponding molecular formula?
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C21H19ClN4O3S
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