CCOC(=O)[C@H]1[C@H]2COc3ccc(OC)cc3[C@@H]2N2C(=O)CN(Cc3ccc(OC)cc3)C(=O)[C@@]12C
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.