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 N-[(E,2S)-4-[6-[2-chloro-4-(1,3-oxazol-2-yl)phenoxy]pyridin-3-yl]but-3-en-2-yl]acetamide using the IUPAC nomenclature.
user
C20H18ClN3O3
assistant