You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[1-(4-bromo-2,5-difluorophenyl)sulfonylpiperidin-4-yl]-2-oxoimidazo[4,5-b]pyridin-1-yl]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17BrF2N4O5S
assistant