O=c1[nH]c2cc([N+](=O)[O-])c(N/N=C/c3ccc([N+](=O)[O-])o3)c([N+](=O)[O-])c2[nH]1
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?