CC(C)(C)N1C(=O)[C@@H]2[C@@H](CC[C@@H]3C(=O)C[C@@H](O)[C@@H](O)[C@H]32)C1=O
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?