CCOC(=O)c1cc2[nH]c3ccccc3c2[n+](-c2ccc([N+](=O)[O-])cc2)c1N.O=C([O-])C(F)(F)F
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?