You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,2R,6S,7R)-5,5-dimethyl-3-(2,4,6-trichlorophenyl)-4-aza-3-azoniatricyclo[5.2.1.02,6]dec-3-ene;2,4,6-trinitrophenolate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H20Cl3N5O7
assistant