You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(3aR,6aS)-2,3,3a,4,6,6a-hexahydro-1H-pyrrolo[3,4-c]pyrrol-5-yl]-3-[3-(trifluoromethyl)phenyl]butan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H21F3N2O
assistant