O=C(NC1(C(F)(F)F)C(=O)Nc2c1c(=O)[nH]c(=O)n2-c1ccc(Cl)cc1)c1ccccc1F
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?