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 N-(10,10a-dihydrophenanthren-9-yl)-7,7-dimethyl-1-phenyl-N-(4-phenylphenyl)benzo[a]phenalen-8-amine .
user
C51H39N
assistant