O=C(Nc1ccc2[nH]c(C(=O)N3CC(CCl)c4c3cc([N+](=O)[O-])c3ccccc43)cc2c1)Nc1ccc2[nH]c(C(=O)N3CC(CCl)c4c3cc([N+](=O)[O-])c3ccccc43)cc2c1
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?