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 5-(furan-2-yl)-3-[2-[3-(furan-2-yl)-5-thiophen-2-yl-3,4-dihydropyrazol-2-yl]-2-oxoethyl]-5-methylimidazolidine-2,4-dione .
user
C21H18N4O5S
assistant