O=[N+]([O-])c1ccc(N/N=C2/CCCC/C(=N\Nc3ccc([N+](=O)[O-])cc3[N+](=O)[O-])CS(=O)(=O)C2)c([N+](=O)[O-])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?