CC(C)C[C@H](NC(=O)N1CCn2c1nc1ccccc12)C(=O)N[C@H](Cc1ccccc1)C(=O)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?