CC(C)C(NC(=O)OC(C)(C)C)C(=O)N(C)C(Cc1ccccc1)C(=O)N(C)C(C(=O)N(C)C(C(=O)O)C(C)C)C(C)C
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.