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 N-[3-[7-[[3-chloro-1-(oxetan-3-yl)pyrazol-4-yl]amino]-2-oxo-3-phenyl-4H-pyrimido[4,5-d]pyrimidin-1-yl]phenyl]prop-2-enamide is given. What is its corresponding molecular formula?
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C27H23ClN8O3
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