O=[N+]([O-])c1ccc2c(c1)/C(=N/N=C1c3ccccc3Cc3ccccc31)c1cc([N+](=O)[O-])cc([N+](=O)[O-])c1-2
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?