You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 6-[[1-(4-fluorophenyl)-5-methylpyrazol-4-yl]methyl]-2-propan-2-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine into its molecular formula.
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C21H24FN5
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