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 N-(4-fluorophenyl)-2-[2-methoxy-4-[(E)-(1-methyl-2,5-dioxoimidazolidin-4-ylidene)methyl]phenoxy]acetamide .
user
C20H18FN3O5
assistant