CCOC(=O)C1=C(Nc2ccc(OC)cc2)S/C(=C\c2cc(OC)c(O)c(OC)c2)C1=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?