You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-ethyl-N-[1-(4-methylphenyl)-2-morpholin-4-ylethyl]-2,3-dioxo-4H-quinoxaline-6-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H28N4O4
assistant