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 3,3-dimethyl-1-[2-(1-methylpiperidin-3-yl)-7,8-dihydro-5H-pyrido[4,3-d]pyrimidin-6-yl]butan-1-one is given. What is its corresponding molecular formula?
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C19H30N4O
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