You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-azaspiro[4.4]nonan-2-yl-[3-(2,2,2-trifluoroethoxy)pyridin-2-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H19F3N2O2
assistant