You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-[(E)-3-(4-methoxyphenyl)prop-2-enyl]-4,6-dimethyl-1H-pyrazolo[3,4-b]pyridin-3-amine is the IUPAC name of a molecule. Please give its molecular formula.
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C18H20N4O
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