You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 5-acetyl-2-[2-[1-(1-benzofuran-2-yl)ethylamino]-2-oxoethyl]-4-methyl-1H-pyrrole-3-carboxylate into its molecular formula.
user
C21H22N2O5
assistant