You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3aS,6R,6aS,9aR,10aS,10bR)-6a,9a-dichloro-6-(5-chloro-2-hydroxyphenyl)-2-ethyl-8-(4-fluorophenyl)-3a,4,6,10,10a,10b-hexahydroisoindolo[5,6-e]isoindole-1,3,7,9-tetrone by IUPAC nomenclature, provide its molecular formula.
user
C28H22Cl3FN2O5
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