O=[N+]([O-])c1ccc(N2N=C(c3ccc4ccccc4c3O)CC2c2ccc(Cl)cc2)c([N+](=O)[O-])c1
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?