CC(C)CC(NC(=O)OC(C)(C)C)C(=O)Oc1ccc2c(=O)c(-c3ccc([N+](=O)[O-])cc3)coc2c1
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?