You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(2R)-2-(1H-benzimidazol-2-ylamino)-2-[3-(trifluoromethyl)phenyl]ethyl]-2-methoxyacetamide by IUPAC nomenclature, provide its molecular formula.
user
C19H19F3N4O2
assistant