CC(C)(C)C(=O)Nc1ccc(C(=O)Nc2cc(NC(=O)c3ccc(NC(=O)C(C)(C)C)cc3)cc(C(=O)O)c2)cc1
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.