CC(NC(=O)OC(C)(C)C)C(=O)NC(Cc1ccccc1)C(=O)NCC(=O)Oc1c(Cl)c(Cl)c(Cl)c(Cl)c1Cl
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.