You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-(1,1-dioxo-1,4-thiazinan-4-yl)-2-phenyl-N-[2-[4-(trifluoromethyl)phenoxy]ethyl]acetamide ?
user
C21H23F3N2O4S
assistant