O=c1[nH]/c(=C/c2ccc(OCc3ccccc3)cn2)c(=O)[nH]/c1=C/c1ccc([N+](=O)[O-])cc1
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?