You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[1-(4-bromo-2-nitrophenyl)-3-methylsulfonylpropan-2-yl]-1-(difluoromethoxy)-2-ethoxybenzene is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20BrF2NO6S
assistant