You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule ethyl 1-[2-[2-[(2R)-3-oxo-4H-1,4-benzothiazin-2-yl]acetyl]oxyacetyl]piperidine-4-carboxylate into molecular formula.
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C20H24N2O6S
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