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 1,2,3,4,6,7,9-heptamethyl-8-(1,2,3,4,5,6,7,8-octamethyl-10-phenanthren-9-ylanthracen-9-yl)dibenzofuran .
user
C55H54O
assistant