O=C(C[n+]1ccccc1)N/N=C(\Cc1nc2ccc([N+](=O)[O-])cc2nc1O)C(=O)Nc1cc(Cl)c(Cl)cc1Cl.[Cl-]
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?