You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 9-[4-[2-methyl-4-(trifluoromethyl)phenoxy]phenyl]-3,4-dihydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide .
user
C21H17F3N2O3S
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