CC(C)C(NC(=O)CNC(=O)C1CCCN1C(=O)C(NC(=O)OC(C)(C)C)C(C)C)C(=O)NCC(=O)OCc1ccccc1
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.