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 1-(4-fluorophenyl)-4-methyl-7-pyridin-4-yl-3,5-dihydro-2H-1,4-benzodiazepine using the IUPAC nomenclature.
user
C21H20FN3
assistant