O=C(CNc1ccccc1[N+](=O)[O-])Nn1cnc2ccc(S(=O)(=O)Nc3ccccc3[N+](=O)[O-])cc2c1=O
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?