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 (6S,7R)-2,7-dimethyl-8-[3-(4-oxoquinazolin-3-yl)propanoyl]-2,8-diazaspiro[5.5]undecan-1-one is given. What is its corresponding molecular formula?
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C22H28N4O3
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