You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named methyl (1R,4aR,8aS)-4a-hydroxy-1-(4-methoxyphenyl)-1,3,4,5,6,7,8,8a-octahydroisoquinoline-2-carboxylate is given. What is its corresponding molecular formula?
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C18H25NO4
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