You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(4,8-diamino-6,7,8,9-tetrahydropyrimido[5,4-b]indolizin-5-yl)phenyl] hypofluorite is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H16FN5O
assistant