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-[[(3R,4S)-1-benzyl-4-fluoropyrrolidin-3-yl]methyl]-2,2,2-trifluoro-N-methylacetamide .
user
C15H18F4N2O
assistant