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-[(2,4-dichlorophenyl)methyl]-2-[4-methyl-4-(4-methylphenyl)-2,5-dioxoimidazolidin-1-yl]acetamide .
user
C20H19Cl2N3O3
assistant