CC(NS(=O)(=O)c1ccc2c(c1)C(=O)c1cc(S(=O)(=O)NC(C)C(=O)O)ccc1-2)C(=O)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?