CCN1C(=O)[C@H]2CC[C@H]3/C(=N\O[C@@H]4O[C@@H](COC(C)=O)[C@@H](OC(C)=O)[C@@H](OC(C)=O)[C@H]4OC(C)=O)C[C@@H](O)[C@@H](O)[C@@H]3[C@@H]2C1=O
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.