N=C1N[C@H](O)[C@H]2C3O[C@]4(O)O[C@H](C(O)[C@@]2(N1)[C@@H]4O)C3(O)CO
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?