COC(=O)[C@H](Cc1ccccc1)NC(=O)[C@]1(C)C[C@H]1[C@H](NC(=O)OCc1ccccc1)c1ccccc1
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?