C[C@@H]1NC(=O)[C@H](CCCN=C(N)N)NC(=O)c2cc([N+](=O)[O-])cc(I)c2OCC[C@@H](C(N)=O)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?