CCc1cc2c(nc1CC)CCN(CC/C(C)=N/OC[C@@H](O)[C@@H]1O[C@@H]3OC(C)(C)O[C@@H]3[C@H]1O)C2
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.