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 (4R,4aS,12bS)-3-(cyclopropylmethyl)-4a-ethoxy-9-hydroxy-2,4,5,6,7a,13-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinolin-7-one is given. What is its corresponding molecular formula?
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C22H27NO4
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