O=C(O)CCC(=O)OCCN(Cc1ccc(Oc2ccc([N+](=O)[O-])cc2)cc1)C(=O)C(Cl)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?