You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[2-(8-chloro-7-fluoronaphthalen-1-yl)-3-fluoropyridin-4-yl]carbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H17ClF2N2O2
assistant