O=C(Nc1cc(Oc2ccccc2)cc([N+](=O)[O-])c1)C12CC3CC(C1)CC(n1cnc(Cl)n1)(C3)C2
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?