O=C1c2ccccc2C(=O)N1CCCCN(C(=O)c1cc([N+](=O)[O-])ccc1Cl)c1ccc(Cl)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?