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 ethane;4-[(2S)-4-methylsulfonyl-1-oxo-2,3-dihydro-1lambda4,4-benzothiazin-2-yl]butan-2-one into molecular formula.
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C15H23NO4S2
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