You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 1-[2-(4a-hydroxy-1,3,4,5,6,7,8,8a-octahydroisoquinolin-2-yl)ethyl]-5-aminopyridin-2-one into molecular formula.
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C16H25N3O2
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