CCN(CC)C(=O)c1ccc2c(c1)C1C(Cl)C(Sc3ccccc3[N+](=O)[O-])CC1C(C(=O)O)N2
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?