O=C(O)c1cccc2c1NC(c1cccc([N+](=O)[O-])c1)C1CC(Sc3ccccc3[N+](=O)[O-])C(Cl)C21
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?