CN[C@@H]1[C@H](O[C@@H]2O[C@H](C)[C@@](O)(CO)[C@H]2O[C@@H]2[C@@H](N=C(N)N)[C@H](O)[C@@H](N=C(N)N)[C@@H](O)[C@H]2O)O[C@@H](CO)[C@H](O)[C@H]1O
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?