CC(=O)OC[C@]1(C)[C@H]2C[C@@H](OC(=O)c3ccccc3)[C@@]34CO[C@](C)(C(=O)[C@@]5(O)C[C@H](C)[C@H](OC(C)=O)[C@@H]5[C@H]3OC(C)=O)[C@@H]4[C@H]21
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.