CC1(C)[C@@H]2CC[C@@]1(C)[C@@H]1O[C@@H](O[C@@H](CN)c3cc(Cl)c(OCc4ccccc4)c(OCc4ccccc4)c3)C[C@H]21
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.