You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1S)-2,2,2-trifluoro-1-[6-[4-fluoro-2-(trifluoromethyl)phenyl]-1-(2-methylpropyl)indol-3-yl]ethanamine ?
user
C21H19F7N2
assistant