CC(C)(C)OC(=O)NCCCC[C@H](NC(=O)C1CCN(C(=O)OC(C)(C)C)CC1)c1nnc([C@H](Cc2ccc(OC(C)(C)C)cc2)NC(=O)OC(C)(C)C)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.