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-[2-[3-hydroxy-2-(hydroxymethyl)prop-1-enyl]pyrazolo[1,5-a]pyridin-3-yl]-2-propan-2-ylpyridazin-3-one is given. What is its corresponding molecular formula?
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C18H20N4O3
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