You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[2-[2-methoxyethyl-[(5-methylfuran-2-yl)methyl]amino]-2-oxoethyl]-N-propan-2-yl-2-thiophen-2-ylacetamide by IUPAC nomenclature, provide its molecular formula.
user
C20H28N2O4S
assistant