O=C(N/N=C1/C[C@@H](O)[C@@H](O)[C@H]2[C@@H]1CC[C@H]1C(=O)N(c3ccc(F)cc3F)C(=O)[C@H]21)OCc1ccccc1
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?