CC1(C)O[C@@H]2[C@@H](COS(=O)(=O)[O-])O[C@@H](n3cnc4c(N)ncnc43)[C@@H]2O1.[K+]
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?