O=C1[C@@H]2[C@@H]3CCCN3[C@@]3(C(=O)Nc4ccccc43)[C@@H]2C(=O)N1c1cc(Cl)cc(Cl)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?