You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1'-benzyl-3-[3-(trifluoromethyl)phenyl]spiro[1,3-thiazine-2,3'-indole]-2',4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H17F3N2O2S
assistant