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 7,7-dimethyl-9-(2-pyridin-4-yl-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)-6-oxa-9-azaspiro[4.5]decane is given. What is its corresponding molecular formula?
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C22H28N4O
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