CC(C)(C)OC(=O)[C@H]1[C@H](c2ccc([N+](=O)[O-])cc2)C2(C(=O)c3ccccc3C2=O)C2c3ccccc3C=NN21
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.