O=C(Nc1ccc(Cl)cc1)c1cc(S(=O)(=O)Nc2n[nH]c(=O)n2-c2ccccc2)c(S)cc1Cl
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?