COC(=O)[C@H](CC(C)C)N(Cc1ccccc1)S(=O)(=O)N(Cc1ccccc1)[C@@H](CC(C)C)C(=O)OC
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?