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 2,7-ditert-butyl-9-[5-tert-butyl-3-methyl-1,3-bis(4-methylphenyl)-2,6a-dihydropentalen-1-yl]-9H-fluorene .
user
C48H56
assistant