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 3-N-(3-chloro-4-fluorophenyl)-2-methyl-5-N-[(2-pyridin-2-yl-1,3-thiazol-5-yl)methyl]-1,2,6-thiadiazinane-3,5-dicarboxamide .
user
C21H20ClFN6O2S2
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