You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 2-[(2S,6S)-2,6-dimethylmorpholin-4-yl]-7-[(2-hydroxy-4-methoxyphenyl)methyl]-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one into its molecular formula.
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C21H28N4O4
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