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 N-[(7R,8aS)-1,4-dioxo-2,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazin-7-yl]-2-(methylamino)-1,3-thiazole-4-carboxamide into its molecular formula.
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C12H15N5O3S
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