You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3-tert-butyl-4-oxo-[1,3,4]thiadiazolo[2,3-c][1,2,4]triazin-7-yl)sulfanyl]-N-[(4-fluorophenyl)-thiophen-2-ylmethyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H20FN5O2S3
assistant