O=Cc1ccc(OCc2cccc(COc3ccc(/C=N\Nc4ccc([N+](=O)[O-])cc4[N+](=O)[O-])cc3)n2)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?