CC(C)(C)N1C(=O)[C@H]2[C@@H](C1=O)[C@@H](c1ccc(Br)cc1)N1C(=O)N(c3ccccc3)C(=O)[C@@]21C
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.