N=C(N)N/N=C(/c1nc2ccc([N+](=O)[O-])cc2[nH]c1=O)C(O)c1ccc([N+](=O)[O-])cc1
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?