NC(=S)N/N=C(/C(=O)Nc1nc2ccc([N+](=O)[O-])cc2s1)C1C(=O)NC(=S)NC1=O
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?