You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-phenyl-5,6,7,8-tetrahydro-3H-pyrido[4,3-d]pyrimidin-4-one;dihydrochloride by IUPAC nomenclature, provide its molecular formula.
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C13H15Cl2N3O
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