NC(=O)[C@@H]1CCCNc2c(I)cc([N+](=O)[O-])cc2C(=O)N[C@@H](CCC(=O)O)C(=O)N[C@@H](CO)C(=O)N1
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.