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 3-(3,4-dimethoxyphenyl)-N-[2-(4-pyridin-2-yl-1,3-thiazol-2-yl)ethyl]prop-2-enamide using the IUPAC nomenclature.
user
C21H21N3O3S
assistant