O=C1C([N-]S(=O)(=O)c2cccs2)=C([n+]2ccc(CCCc3ccccc3)cc2)C(=O)c2ccccc21
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?