You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 5-chloro-4-[4-[[2-(5-methoxypyridin-2-yl)cyclopropyl]methoxy]-2-methylpyrimidin-5-yl]-1H-pyridin-2-one into molecular formula.
user
C20H19ClN4O3
assistant