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 2-[4-[[(3S)-3-[3-(1H-imidazol-2-yl)pyrazin-2-yl]piperidin-1-yl]methyl]phenoxy]acetic acid is given. What is its corresponding molecular formula?
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C21H23N5O3
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