NC(=O)[C@@H]1CCCNc2c(I)cc([N+](=O)[O-])cc2C(=O)N[C@@H](Cc2ccccc2)C(=O)N[C@@H](Cc2c[nH]cn2)C(=O)N1
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?