C[C@]12[C@H](O)C[C@@H]3[C@H](CC[C@H]4C[C@@H](O)CC[C@]43C)[C@]1(O)CC[C@@H]2C1=CC(=O)OC1
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.