CC(C)C[C@@H](CC(=O)N[C@@H](CCCN)CC(=O)N[C@@H]1CCCC[C@H]1C(=O)N[C@H](CC(=O)N[C@@H](CCC(=O)O)CC(=O)O)CC(C)C)NC(=O)[C@@H]1CCCC[C@H]1N
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.