You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-benzyl-2-ethyl-7-(trifluoromethyl)-1,3,3a,4,5,9b-hexahydrobenzo[g]isoindol-1-yl] methanesulfonate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26F3NO3S
assistant