COCCn1c(=O)[nH]c(=O)c2c1nc(-c1ccc(-c3ccc(Cl)cc3[N+](=O)[O-])o1)n2Cc1ccccc1
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?