COC(=O)[C@H](Cc1ccc(OC(C)(C)C)cc1)N[C@H](C)C(=O)N[C@@H](Cc1ccccc1)C(=O)OCc1ccccc1
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?