O=C(Cn1c2ccccc2c(=O)c2ccccc21)N/N=C/c1cc([N+](=O)[O-])ccc1N1CCCCC1
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?