O=[N+]([O-])C(C(Cl)=C(Cl)Cl)=C(N(Cc1ccccc1)Cc1ccccc1)N(Cc1ccccc1)Cc1ccccc1
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?