You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-1-[[3,5-bis(trifluoromethyl)phenyl]methoxy]-3-(methylamino)-2-phenylpropan-2-yl]formamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H20F6N2O2
assistant