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 N-[(7S,8aS)-2-[3-(trifluoromethyl)benzoyl]-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-7-yl]-4-fluorobenzamide .
user
C22H21F4N3O2
assistant