You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[5-(7-fluoro-1H-pyrazolo[4,3-b]indol-4-yl)-4-methylpyrimidin-2-yl]azetidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16FN7O
assistant