CCOC(=O)CCC(C(=O)OCC)n1nnc2cc(Nc3c(C)[n+]([O-])c4ccc(Cl)cc4[n+]3[O-])ccc21
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?