COCC[N+](CCNC(=O)c1cccc2c(N)c3cccc(C)c3nc12)(CCOC)Cc1ccc([N+](=O)[O-])cc1.Cl.[Cl-]
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?