You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[4-(2,5-difluorophenyl)-1,3-thiazol-2-yl]-2-(1,1-dioxo-1,4-thiazinan-4-yl)-2-phenylacetamide ?
user
C21H19F2N3O3S2
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