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 (2R,4aS,10aR)-7-[2-(3,4-difluorophenyl)ethynyl]-2-hexyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene .
user
C28H32F2
assistant