O=C(/C=C/c1cccc([N+](=O)[O-])c1)NCCN1C(=O)S/C(=C\c2ccc(F)cc2)C1=O
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?