You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name (2-methoxyphenyl)-[(2R)-2-[5-(5-methylpyrazin-2-yl)-1,3,4-oxadiazol-2-yl]piperidin-1-yl]methanone into its molecular formula.
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C20H21N5O3
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