COC(=O)[C@H](Cc1ccc(O)c(Br)c1)NC(=O)[C@H](Cc1ccc(O)cc1)NC(=O)OC(C)(C)C
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?