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 N-[(2S)-2-hydroxy-2-methyl-4-phenylbutyl]-N'-[3-(trifluoromethyl)phenyl]oxamide is given. What is its corresponding molecular formula?
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C20H21F3N2O3
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