You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (9S)-9-(4-fluorophenyl)-4-(4-methylpiperazin-1-yl)-2,4,6,8,10,17-hexazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(17),6,11,13,15-pentaene by IUPAC nomenclature, provide its molecular formula.
user
C22H25FN8
assistant