You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,6R,6aS,9aR,10aS,10bR)-8-(bromomethyl)-6a,9a-dichloro-6-(2-hydroxy-6-methoxyphenyl)-2-(3-nitrophenyl)-3a,4,6,10,10a,10b-hexahydroisoindolo[5,6-e]isoindole-1,3,7,9-tetrone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H22BrCl2N3O8
assistant