O=C(Nc1ccccc1[N+](=O)[O-])/C(=N/Nc1cccc(Cl)c1)c1c(O)c2ccccc2oc1=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?