You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,4S)-N-[(1S)-1-(6-methoxypyridin-2-yl)ethyl]-4-[5-(trifluoromethyl)pyridin-2-yl]pyrrolidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21F3N4O2
assistant