CC(C)(C)OC(=O)C[C@H]1C/C=C\C[C@H](CC(=O)N[C@@H](CO)Cc2ccccc2)C(=O)N[C@H](C(C)(C)C)COC1=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.