O=C(Nc1cccc([N+](=O)[O-])c1)/C(=N\NC(=O)c1ccncc1)c1nc2ccc([N+](=O)[O-])cc2nc1O
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?