You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-tert-butyl-6-[(6-chloro-2-methylpyridin-3-yl)methyl]-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine .
user
C18H23ClN4
assistant