You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-cyclopropyl-8-[[2-fluoro-4-(trifluoromethyl)phenyl]methyl]-2,8-diazaspiro[5.5]undecan-3-one is given. What is its corresponding molecular formula?
user
C20H24F4N2O
assistant