CC(=O)OCC1OC(Oc2cc(OC(C)=O)c3c(=O)cc(-c4ccc(OC(C)=O)c(OC(C)=O)c4)oc3c2)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?