COC(=O)C(CC(C)C)NC(=O)C(Cc1ccccc1)NC(=O)C1CCCN1C(=O)C(CO)NC(=O)c1ccc(-c2ccc(Cl)cc2Cl)o1
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.