You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9-phenyl-14-[9-(4-phenylphenyl)carbazol-3-yl]-9,14-diazapentacyclo[11.7.0.02,10.03,8.015,20]icosa-1(13),2(10),3,5,7,11,15,17,19-nonaene by IUPAC nomenclature, provide its molecular formula.
user
C48H31N3
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