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 [3-(3-fluorophenyl)-6,8-dihydro-5H-imidazo[1,2-a]pyrazin-7-yl]-pyridin-2-ylmethanone .
user
C18H15FN4O
assistant