C[C@@H](NC(=O)Nc1cccc(C(=O)Nc2cc(C(C)(C)C)ccc2C(=O)O)n1)c1ccccc1
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?