You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(6-ethyl-2-oxo-1H-quinolin-3-yl)methyl]-3-(4-fluorophenyl)-1-[(4-methylphenyl)methyl]urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26FN3O2
assistant