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 [(6R,7S)-3-tert-butyl-6-(4-chlorophenyl)-6,7-dihydro-5H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-7-yl]-(4-fluorophenyl)methanone .
user
C21H20ClFN4OS
assistant