CCOC(=O)N1CCN([N+]([O-])=NOc2cc(O/N=[N+](\[O-])N(CC)CC)c([N+](=O)[O-])cc2[N+](=O)[O-])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.