C[C@@H]1C[C@@H]2OC(=O)[C@]3(C)[C@H]2[C@@H](OC3(C)O)[C@]2(C)C(=O)C=C[C@H]12
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?