You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2S)-N-(5-chloropyridin-2-yl)-2-[(3S,5S)-3-methyl-5-(6-oxo-1H-pyridin-3-yl)piperidin-1-yl]propanamide using the IUPAC nomenclature.
user
C19H23ClN4O2
assistant