You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(6-butyl-5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)sulfanyl]-N-[4-(difluoromethylsulfonyl)phenyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23F2N5O3S2
assistant