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 (2S)-6-amino-7-[(2-methylpropan-2-yl)oxy]-2-[(2-methylpropan-2-yl)oxycarbonyl]-7-oxo-2-[[(2S)-pyrrolidine-2-carbonyl]amino]heptanoic acid into molecular formula.
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C21H37N3O7
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