You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[1-hydroxy-1-[4-(trifluoromethyl)phenyl]butan-2-yl]-2-imidazol-1-ylacetamide by IUPAC nomenclature, provide its molecular formula.
user
C16H18F3N3O2
assistant