You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 6-bromo-3-[3-oxo-3-[(1R)-1-phenyl-3,4-dihydro-1H-pyrrolo[1,2-a]pyrazin-2-yl]propyl]quinazolin-4-one .
user
C24H21BrN4O2
assistant