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 6-cyclopropyl-3-[[1-(2-methylpyrimidin-4-yl)piperidin-4-yl]methyl]pyrimidin-4-one using the IUPAC nomenclature.
user
C18H23N5O
assistant