You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 9-(18-dibenzofuran-2-yl-9,14-dioxapentacyclo[11.7.0.02,10.03,8.015,20]icosa-1(13),2(10),3(8),4,6,11,15(20),16,18-nonaen-5-yl)carbazole .
user
C42H23NO3
assistant