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-[3-(1-benzylindol-3-yl)-3-hydroxypropyl]-7,7-dimethyl-3,4,8,9a-tetrahydro-1H-pyrazino[1,2-a]pyrazine-6,9-dione into its molecular formula.
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C27H32N4O3
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