You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[4-(5-ethyl-3-methylcyclopenta-1,3-dien-1-yl)-5-pentylcyclopenta-1,3-dien-1-yl]but-1-en-2-ylbenzene .
user
C28H36
assistant