You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-[8-amino-6-(4-methylpyridin-3-yl)-2,7-naphthyridin-3-yl]-2-(cyanomethyl)cyclopropane-1-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H18N6O
assistant