You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[[1-[[1-(2,4-difluorophenyl)pyrazol-3-yl]methyl]piperidin-3-yl]methylamino]acetic acid by IUPAC nomenclature, provide its molecular formula.
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C18H22F2N4O2
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