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-(9-cyclohexyl-1,7-dimethyl-2,4-dioxo-7,8-dihydro-6H-purino[7,8-a]pyrimidin-3-yl)acetamide into its molecular formula.
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C18H26N6O3
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