You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(1R,2R)-1-amino-2,3-dihydro-1H-inden-2-yl]-3-fluoro-3-(4-fluorophenyl)butan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19F2NO
assistant