CC(C)(C)OC(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](CO)[C@H](O)[C@@H]1C[C@@H]1C(=O)NC1CCCCC1
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.