You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3-methylphenyl)-N-[2-[(2-phenoxyacetyl)amino]ethyl]-1,2,4-oxadiazole-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20N4O4
assistant