Cc1nc(/N=N\c2cc(S(=O)(=O)[O-])c3cc([N+](=O)[O-])cc(S(=O)(=O)[O-])c3c2)c(COP(=O)([O-])[O-])c(C=O)c1O.[Na+].[Na+].[Na+].[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?