You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-(5-chloro-2-hydroxyphenyl)-2-(3-nitrophenyl)-6a,9-diphenyl-4,6,10a,11,11a,11b-hexahydro-3aH-naphtho[6,7-e]isoindole-1,3,7,10-tetrone by IUPAC nomenclature, provide its molecular formula.
user
C40H29ClN2O7
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