You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(4R,6R)-8-fluoro-6-(3-methoxy-2-methylphenyl)-1-(trifluoromethyl)-4,6-dihydro-[1,2,4]triazolo[4,3-a][4,1]benzoxazepin-4-yl] acetate .
user
C21H17F4N3O4
assistant