O=C(NCCCNCCN1C(=O)c2cccc3cc([N+](=O)[O-])cc(c23)C1=O)c1cc(-c2ccccc2)nc2ccccc12
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?