You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-fluoro-3-(1,1,2,2,2-pentafluoroethyl)-7-(4-propylcyclohexyl)-3,4-dihydro-1H-isochromene is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24F6O
assistant