N=C(N)N/N=C/c1oc(-c2ccc(S(=O)(=O)O)o2)c(-c2ccc(S(=O)(=O)O)o2)c1[N+](=O)[O-]
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?