You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9S)-3-(4-chloro-3-fluorophenyl)imino-6-ethoxy-9,11,11-trimethyl-1-azatricyclo[6.3.1.04,12]dodeca-4,6,8(12)-trien-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22ClFN2O2
assistant