COc1ccc2c(c1)C(=O)N1[C@H]3c4cc(OC)ccc4OC[C@@H]3[C@H](c3ccccc3)[C@]1(C)C(=O)N2
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.