You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-butyl-N-[2-[furan-2-ylmethyl-[[(2S)-oxolan-2-yl]methyl]amino]-2-oxoethyl]butanamide into its molecular formula.
user
C20H32N2O4
assistant