CC(C)N(C(=O)COC(=O)[C@@H]1CC(O)CN1S(=O)(=O)c1ccccc1[N+](=O)[O-])C(C)C
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?