COc1ccc(C(=O)COC(=O)[C@H](C)Nc2ccc(C(F)(F)F)cc2[N+](=O)[O-])c(OC)c1
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?