Cc1ccc([C@@H]2[C@@H]3C(=O)N(C)C(=O)[C@@H]3[C@]3(C)C(=O)N(CC4CC4)CC(=O)N23)o1
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.