O=C1C2C3C=CC(CNS(=O)(=O)c4ccccc4[N+](=O)[O-])(O3)C2C(=O)N1c1ccccc1
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?