CC1=NC2(C(=O)O)C3(C(=O)O)N=C(C)OC3(C(F)(F)F)C2(C(F)(F)F)O1
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?