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 tert-butyl 4-[2-(6-methoxypyridin-3-yl)ethynyl]-3,6-dihydro-2H-pyridine-1-carboxylate using the IUPAC nomenclature.
user
C18H22N2O3
assistant