O=[N+]([O-])c1ccc2c(c1)/C(=N/N=C1/c3cc([N+](=O)[O-])ccc3-c3c1cc([N+](=O)[O-])cc3[N+](=O)[O-])c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1-2
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?