Cn1cnnc1Sc1cc(N2CCN(S(=O)(=O)c3ccc(Cl)c(Cl)c3)CC2)ccc1[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?