You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-(4-morpholin-4-ylphenyl)-1-[4-[5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl]phenyl]ethanone ?
user
C21H18F3N3O3
assistant