O=[N+]([O-])c1cc(C(F)(F)F)cc([N+](=O)[O-])c1NCCN=C(S)Nc1ccc(Cl)c(Cl)c1
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?