N#CC1(Cc2ccccc2[N+](=O)[O-])c2ccccc2C2C(N1C(=O)c1ccccc1)C2(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?