You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-methyl-4-(pyrimidin-2-ylmethyl)-7-[4-(trifluoromethyl)phenyl]-2,3-dihydro-1,4-benzoxazepin-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H18F3N3O2
assistant