C=C1[C@@H](O)C[C@@]23CC[C@@H]4[C@@]5(C)CC[C@@H](OC(C)=O)C(C)(C)[C@@H]5C[C@@H](OC5OC(COC(C)=O)C(O)C(O)C5O)[C@@]4(C)C2=CC[C@H]3[C@H]1C
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.