You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-[3-(3-chlorophenyl)-1,2,4-oxadiazol-5-yl]-N-[[(2R)-1,4-dioxan-2-yl]methyl]-N-methylpyridin-2-amine by IUPAC nomenclature, provide its molecular formula.
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C19H19ClN4O3
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