Cc1c(C(=O)C/C(=N\O)C(=O)Nc2cc(Cl)c(Cl)cc2Cl)[n+]([O-])c2ccccc2[n+]1[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?