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 6-[[2-(4-fluorophenyl)-1H-indol-3-yl]methyl]-2-methyl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine .
user
C23H21FN4
assistant