You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-[(2,5-difluorophenyl)methylsulfonyl]azetidin-3-yl]oxy-4-(trifluoromethyl)pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H13F5N2O3S
assistant