You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 8-chloro-3-(cyclopropylmethyl)-7-[(3R)-4-(3,5-difluorophenyl)-3-methylpiperazin-1-yl]-[1,2,4]triazolo[4,3-a]pyridine into molecular formula.
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C21H22ClF2N5
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