You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 4-[3-(4-methoxyphenyl)-1,2,4-oxadiazol-5-yl]-N-[2-(trifluoromethyl)phenyl]butanamide ?
user
C20H18F3N3O3
assistant