You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 6-methyl-4-[4-(1H-pyrrolo[2,3-b]pyridin-3-yl)-3,6-dihydro-2H-pyridin-1-yl]-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidine by IUPAC nomenclature, provide its molecular formula.
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C20H22N6
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