You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 21-[4-(3-phenylquinoxalin-2-yl)dibenzofuran-1-yl]-21-azapentacyclo[12.7.0.02,7.08,13.015,20]henicosa-1(14),2,4,6,8,10,12,15,17,19-decaene by IUPAC nomenclature, provide its molecular formula.
user
C46H27N3O
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