You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,6-ditert-butyl-1-cyclopenta-1,3-dien-1-yl-2,7-bis(4-methylphenyl)-4-nonan-5-ylidenefluorene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C49H58
assistant