You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance ethyl 5-[[2-[4-(4-methoxyphenyl)-4-methyl-2,5-dioxoimidazolidin-1-yl]acetyl]amino]-3-methylthiophene-2-carboxylate .
user
C21H23N3O6S
assistant