Cc1cc2c(cc1C)[n+]([O-])c(C(=O)C/C(=N/OCCCc1ccccc1)C(=O)Nc1cc(Cl)ccc1Cl)c(C)[n+]2[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?