C[C@]12CC[C@H](O)C[C@@H]1CC[C@@H]1[C@@H]2CC[C@@]2(C)[C@H]1CCC(=O)[C@]21CCCO1
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?