You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-hydroxy-2-[4-(trifluoromethoxy)phenyl]ethyl]-3-(2-oxopyrrolidin-1-yl)benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H19F3N2O4
assistant