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 (1R,2R,6R,7R)-4-[(Z)-(4-ethoxyphenyl)methylideneamino]spiro[4-azatricyclo[5.2.1.02,6]dec-8-ene-10,1'-cyclopropane]-3,5-dione is given. What is its corresponding molecular formula?
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C20H20N2O3
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