You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Please write the molecular formula of the molecule 7-(3,4-dichlorophenyl)-6-imidazo[1,5-a]pyridin-3-yl-5-(methoxymethyl)-4,7-dihydropyrazolo[1,5-a]pyrimidine .
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C21H17Cl2N5O
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