COc1ccc(NC(=O)c2nn(C34C[C@H]5C[C@@H](C3)C[C@@H](C4)C5)cc2[N+](=O)[O-])cc1
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?