O=C(c1ccccc1)N1C(=S)N(c2ccc([N+](=O)[O-])cc2)C(=N/c2ccccc2)/C1=N\c1ccccc1
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?