O=C1C[C@H]2[C@H](c3ccc(Br)cc3)[C@H]3C(=O)c4ccccc4NC(=O)[C@@H]3[C@@]2(O)c2ccccc2N1
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.