You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 11-[(7Z)-4,8-diphenyl-5,6-dihydro-1,3-diazocin-2-yl]-7-methylidene-5-phenyl-7aH-indeno[1,2-d][1]benzazepin-6-one by IUPAC nomenclature, provide its molecular formula.
user
C42H31N3O
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