You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2,4-dimethyl-9-[2-phenyl-1-(trifluoromethoxy)ethyl]-1-oxa-4,9-diazaspiro[5.5]undecan-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H25F3N2O3
assistant