You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-fluorophenyl)-11-phenyl-1,8,10,12-tetrazatricyclo[7.3.0.03,7]dodeca-2,7,9,11-tetraen-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H16FN5
assistant