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 (3R)-N-[(4-chlorophenyl)methyl]-N-[[(2R)-oxolan-2-yl]methyl]-2,3-dihydro-1,4-benzodioxine-3-carboxamide into molecular formula.
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C21H22ClNO4
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