O=C(Cn1cc(S(=O)(=O)c2ccc(Cl)cc2)c(=O)c2ccccc21)Nc1ccc2c(c1)OCO2
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?