You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,3S,4R)-3-[4-[[5-(trifluoromethyl)pyridin-2-yl]methyl]phenyl]-2-oxa-5-azabicyclo[2.2.1]heptane is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H17F3N2O
assistant