COC(=O)c1c(OC)cc2c(c1C)Oc1c(Cl)c(OC(C)=O)c(Cl)c(C)c1C(=O)O2
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?