You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-amino-4-[3-(4-fluorophenyl)-5-hydroxy-6-oxo-1H-pyridin-2-yl]benzenecarboximidamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H15FN4O2
assistant