You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-chloro-6-fluorophenyl)-N-[2-(4-chlorophenyl)-2-oxoethyl]-5-methyl-1,2-oxazole-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H13Cl2FN2O3
assistant