Nc1nc2c(nc(Br)n2[C@@H]2O[C@H]3COP(=O)([O-])O[C@@H]3[C@H]2O)c(=O)[nH]1.[Na+]
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?