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For the molecule named tert-butyl N-[[(2S)-1-[5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrimidin-2-yl]piperidin-2-yl]methyl]carbamate by IUPAC nomenclature, provide its molecular formula.
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C21H35BN4O4
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