You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(3,4-difluoroanilino)-2-oxoethyl] 3-[5-(4-methylphenyl)-1,3-oxazol-2-yl]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H18F2N2O4
assistant