You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 9-[4-(20,20,21,21-tetramethyl-9-oxapentacyclo[11.8.0.02,10.03,8.014,19]henicosa-1(13),2(10),3,5,7,11,14(19),15,17-nonaen-17-yl)phenyl]carbazole into its molecular formula.
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C42H33NO
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