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 6-chloro-2-[[5-(6-oxa-1-azaspiro[3.3]heptane-1-carbonyl)pyrimidin-2-yl]amino]-2,3-dihydro-1H-indene-4-carbonitrile is given. What is its corresponding molecular formula?
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C20H18ClN5O2
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