You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-bromo-2-(trifluoromethoxy)phenyl]sulfonyl-6-[(4-chlorophenyl)methyl]-8-propan-2-yl-3,6-dihydro-2H-pyrazino[1,2-a]pyrimidine-4,7-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H22BrClF3N3O5S
assistant