You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7-(dimethylamino)-6-fluoro-4-oxo-8-[[4-(trifluoromethyl)phenyl]methyl]-1H-quinoline-3-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C20H15F4N3O
assistant