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 2-[4-(6-methoxyspiro[1,3-dihydroisoquinoline-4,1'-cyclopropane]-2-carbonyl)phenoxy]acetic acid is given. What is its corresponding molecular formula?
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C21H21NO5
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