CC(=O)OCC1OC(N2C(=O)[C@@H](Oc3ccccc3)[C@H]2/C=C/c2ccccc2)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?