You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(2-fluorophenyl)-N-[[3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl]methyl]-4-oxobutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H15F2N3O3
assistant