You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-chloro-6-fluoro-4-oxo-8-[[4-(trifluoromethyl)phenyl]methyl]-1H-quinoline-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H10ClF4NO3
assistant