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Under IUPAC nomenclature, a molecule named 2,5-dimethyl-6-[2-methyl-4-[[(1S,2S)-2-(5-methylpyridin-2-yl)cyclopropyl]methoxy]pyrimidin-5-yl]pyridazin-3-one is given. What is its corresponding molecular formula?
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C21H23N5O2
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