You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-chloro-8-[[(S)-[3-(trifluoromethyl)phenyl]methylsulfinyl]methyl]-3,4-dihydro-2H-1,5-benzodioxepine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H16ClF3O3S
assistant