C[C@H](O)[C@@H]1C(=O)N2CCc3ccc(N4CCOCC4)cc3[C@@H]2C[C@@H]1N(C)C(=O)Nc1ccccc1
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?