CN[C@@H](C)C(=O)N[C@H](C(=O)N[C@@H](C)C(=O)NC(c1ccccc1)c1ccccc1)C(C)C.O=CO
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?