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 1,1-difluoroethane;(9E)-7-ethyl-9-[(Z)-2-methylidene-4-(2-methylphenyl)but-3-enylidene]-3,4,7,8-tetrahydrobenzo[7]annulene .
user
C27H32F2
assistant