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 9-(4-chloro-7-methoxyquinazolin-6-yl)oxy-5-oxo-1-(2,2,2-trifluoroacetyl)-1,4-diazaspiro[5.5]undecane-4-carboxylic acid is given. What is its corresponding molecular formula?
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C21H20ClF3N4O6
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