COc1cc(C2C(C(=O)Nc3ccc([N+](=O)[O-])cc3)=C(C)NC(C)=C2C(=O)Nc2ccc([N+](=O)[O-])cc2)ccc1O
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.