COC(=O)[C@]12CC[C@H]3CN(C(=O)OCc4ccccc4)[C@H]([C@H]31)[C@H](c1ccco1)N2S(=O)(=O)c1ccc(C)cc1
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.