You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(3R,4S)-4-(dimethylamino)-3-(3-hydroxypropyl)piperidin-1-yl]-2-[2-(trifluoromethyl)phenyl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H27F3N2O2
assistant