CC1(C)C(=O)[C@@H]2OC2[C@@]2(C)C1CC(O)[C@]1(C)C2CC[C@@]2(C)C(c3ccoc3)OC(=O)C3OC321
PSA is a commonly used medicinal chemistry metric for the optimization of a drug's ability to permeate cells. Please predict psa of this molecule.