O=[N+]([O-])c1ccc(CSC2=C(c3ccc(Cl)cc3)S/C(=C3\SC(SCc4ccc([N+](=O)[O-])cc4)=C(c4ccc(Cl)cc4)S3)S2)cc1
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?