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 methyl 3-[[(2R)-4-ethylsulfonyl-2,3-dihydro-1,4-benzoxazine-2-carbonyl]amino]benzoate is given. What is its corresponding molecular formula?
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C19H20N2O6S
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