COC(=O)Cc1c[nH]c2cccc(OCC(O)CN(Cc3ccc([N+](=O)[O-])cc3)C(C)(C)C)c12.Cl
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?