Cc1cc(Oc2cc(NN3CCCCC3)c([N+](=O)[O-])cc2[N+](=O)[O-])ccc1[N+](=O)[O-]
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?