CN1C[C@H](C(=O)N[C@@]2(C)O[C@@]3(O)[C@H]4CCCN4C(=O)[C@@H](Cc4ccccc4)N3C2=O)C=C2c3cccc4[nH]cc(c34)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.