You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-(2-oxoazepan-1-yl)-N-[[(2S)-oxolan-2-yl]methyl]-N-(pyridin-4-ylmethyl)propanamide into its molecular formula.
user
C20H29N3O3
assistant