O=C(C1=NN[C@@H]2C(=O)N(c3cccc(C(F)(F)F)c3)C(=O)[C@H]12)c1cnccn1
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?