Cc1nc(/N=N\c2ccc(C(=O)[O-])cc2)c(COP(=O)([O-])[O-])c(C=O)c1O.[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?