CN[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](CCCCN)C(=O)NNc1ccccc1)C(C)C.O=CO
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?