COC(=O)CC1C2(C)CC34OC5(C)O[C@@]6(C7/C(=C(/O)C(C)C)C(=O)OC(c8ccoc8)[C@]7(C)C(OC(C)=O)C(OC(C)=O)[C@]6(O5)[C@@]13C)C(OC(C)=O)[C@]4(O)C2OC(=O)C(C)C
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.