You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 2-[4-[(4aR,8aS)-3,3-dimethyl-2,4,4a,5,6,7,8,8a-octahydroquinoxalin-1-yl]-3-fluorophenoxy]-2,2-difluoroethanol ?
user
C18H25F3N2O2
assistant