COC(=O)c1nc2n(n1)C(c1ccc([N+](=O)[O-])cc1)C(C(=O)Nc1ccc(Cl)cc1)=C(C)N2
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?