You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 6-methyl-1-[(4-methylphenyl)methyl]-N-prop-2-ynylpyrazolo[3,4-b]pyridine-4-carboxamide is given. What is its corresponding molecular formula?
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C19H18N4O
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