You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3,5-dioxo-2H-1,2,4-triazin-6-yl)amino]-N-[(E)-(4-ethoxy-3-methoxy-5-nitrophenyl)methylideneamino]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H17N7O7
assistant