You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-[[5-[(6-cyano-4-methylpyridin-3-yl)amino]-3-methylimidazo[4,5-b]pyridin-7-yl]amino]-N,N-dimethylpyridazine-3-carboxamide into molecular formula.
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C21H20N10O
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