CC(=O)N[C@H]1[C@H](Oc2ccc3c(c2)CCC2C3CC[C@]3(C)C(=O)CCC23)O[C@H](CO)[C@@H](O)[C@@H]1O
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.