You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule ethyl 2-[4-[(E)-(2,5-dioxo-1-phenylimidazolidin-4-ylidene)methyl]-2-iodo-6-methoxyphenoxy]acetate .
user
C21H19IN2O6
assistant