O=c1c2nc(Br)n([C@@H]3O[C@@H]4CO[P@@](O)(=S)O[C@H]4[C@H]3O)c2[nH]c2nc(-c3ccccc3)cn12
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?