O=C(CNc1c(Cl)cccc1Cl)NC1C=Cc2ccc(S(=O)(=O)Nc3c(Cl)cccc3Cl)cc2C1=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?