CC(=O)OCC1OC(c2c(OC(C)=O)cc(C)c3c(=O)cc(/C(C(C)=O)=C(\C)O)oc23)C(OC(C)=O)C(OC(C)=O)C1OC(C)=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?